Performance Monitoring User s Manual

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1 NEC Storage Software Performance Monitoring User s Manual IS025-15E

2 NEC Corporation No part of the contents of this book may be reproduced or transmitted in any form without permission of NEC Corporation. The contents of this book may be modified without notice in the future.

3 Preface This manual describes how to use the NEC Storage PerformanceMonitor (performance monitoring function). The performance monitoring function is for monitoring the performance of the NEC Storage series disk array subsystem, collecting performance information, and displaying the performance in real-time. Refer to the NEC Storage Software Manual Guide (IS901) for the overview of the NEC Storage and the related manuals. Remarks 1. This manual explains functions implemented by the following program products: NEC Storage Manager and NEC Storage BaseProduct NEC Storage PerformanceMonitor 2. This manual is applicable to the program products of the following versions: NEC Storage Manager Ver6.2 NEC Storage BaseProduct Ver The NEC Storage Manager is referred to as ism or Storage Manager in this manual unless clearly specified. Also, the following terms refer to the corresponding NEC Storage software products. Term NEC Storage Software Product BaseProduct NEC Storage BaseProduct PerformanceMonitor NEC Storage PerformanceMonitor PerformanceNavigator NEC Storage PerformanceNavigator 4. The NEC Storage series disk array subsystem is referred to as a disk array in this manual unless clearly specified. Also, the following terms refer to the corresponding NEC Storage hardware products. Term NEC Storage Hardware Product D1 series NEC Storage D1 series D3 series NEC Storage D3 series D4 series NEC Storage D4 series D8 series NEC Storage D8 series D1-10 NEC Storage D1-10 D3-10 NEC Storage D3-10 xxx series or xxxx series NEC Storage xxx series or NEC Storage xxxx series Sxxx or Sxxxx NEC Storage Sxxx or NEC Storage Sxxxx * xxx and xxxx represent the model number.

4 5. The following terms in this manual refer to the NEC Storage software manuals. Term NEC Storage Software Manual User's Manual (UNIX) User's Manual Configuration Setting Tool User's Manual (GUI) Messages Handbook Performance Optimization User's Manual Data Replication User s Manual (Disaster Recovery System Installation and Operation Guide) Cache Partitioning User's Manual Manual Guide 6. Trademarks and registered trademarks NEC Storage Software NEC Storage Manager User's Manual (UNIX) (IS001) NEC Storage Software NEC Storage Manager User's Manual (IS004) NEC Storage Software Configuration Setting Tool User's Manual (GUI) (IS007) NEC Storage Software Messages Handbook (IS010) NEC Storage Software Performance Optimization User's Manual (IS026) NEC Storage Software Data Replication User s Manual (Disaster Recovery System Installation and Operation Guide) (IS027) NEC Storage Software Cache Partitioning User's Manual (IS038) NEC Storage Software Manual Guide (IS901) UNIX is a registered trademark of The Open Group in the United States and other countries. Microsoft, Windows, Windows, Windows Vistas, and Excel are trademarks or registered trademarks of Microsoft Corporation in the United States and other countries. Other product names and company names, etc. are trademarks or registered trademarks of the associated companies. 7. This product includes the OSSs below. For details on the licenses, refer to Appendix D of this manual. Apache log4j ( flex ( OpenSSL ( 8. In this document, the capacity is calculated based on units of 1024 (for example 1 KB = 1024 bytes) unless otherwise specified. 9. In this document, System Volume means Storage System Volume unless otherwise specified. 10. In this document, matters to which careful attention needs to be paid will be described as follows: Be sure to observe the instructions. If the indications are ignored and the system is improperly operated, settings which have been already made might be affected. Type of Indication Type Description Describes contents which require users to pay special attention for operation. Describes information about restrictions on operation. 1st Edition in October th Edition in January 2010

5 Contents Chapter 1 Overview of Performance Monitoring Function Performance Monitoring Function PerformanceMonitor and Related Product System Configuration Operation of Performance Monitoring Function Function Overview Displaying Load Status in Real-Time Monitoring Overloads Supporting Statistic Information Analysis Accumulating Statistic Information Summarizing Statistic Information Keep Period of Statistic Information Downloading Statistic Information Extracting Statistic Information Editing Statistic Information...53 Chapter 2 Installation of Performance Monitoring Function Server Installation System Requirements Installation Environment Setting Client Installation System Requirements Installation...57 Chapter 3 Operations of Performance Monitoring Function Displaying Load Status in Real-Time Monitoring Overloads Operating Instructions (Performance Monitoring Screen) Operating Instructions (Threshold Operation Command) Support for Analysis of Statistic Information Accumulating Statistic Information Downloading Statistic Information Summarizing Statistic Information Description of Operations (UNIX) Description of Operations (Windows) Extracting Statistic Information Description of Operations (UNIX) i

6 Description of Operations (Windows) Editing Statistic Information Description of Operations (UNIX) Description of Operations (Windows) Appendix A Commands of Performance Monitoring Function A.1 Threshold Operation Commands 123 A.1.1 Thresholds Setting A.1.2 Thresholds Deletion A.1.3 Thresholds Display A.1.4 Threshold Excess State Resetting A.1.5 Threshold Monitoring Condition Setting A.1.6 Customize Resetting Threshold Excess State A.2 Starting/Stopping Accumulation of Statistic Information 143 A.3 Archiver 145 A.4 CSV Conversion Tool 153 A.5 Editor Tool 162 Appendix B Display of the Threshold Operation Command B.1 Thresholds Display 167 B.2 Threshold Monitoring Condition Display 174 B.3 Displaying Condition to Reset Threshold Excess State 175 Appendix C CSV File Structure Appendix D Report Format of Performance Report Editor Appendix E Estimating Size of Files for Performance Monitoring Function Appendix F Notes F.1 Notes on Real-Time Display of Load Status 235 F.2 Notes on Accumulating Statistic Information 235 F.3 Notes on Summarizing/Extracting/Editing Statistic Information 235 F.4 Notes on Incompatibility 236 Appendix G License G.1 Apache log4j License 237 G.2 Flex License 243 G.3 OpenSSL License 244 Index ii

7 Chapter 1 Overview of Performance Monitoring Function Chapter 1 Overview of Performance Monitoring Function 1..1 Performance Moniitoriing Functiion The performance monitoring function is a function for centrally monitoring performance of storage devices from the ism client Performance Monitoring screen when the devices are under control of the ism. The use of this performance monitoring function is capable of real-time monitoring of loads, detection of overload, and management of statistic information (performance information of the past). The function allows an administrator to investigate the cause of access performance deterioration, detect abrupt increases of accesses, and take proper measures against symptoms of failures on the application server. Thus, this function enables constantly stable operation of storage devices. Application Server Performance Monitoring Screen ARRAY1 ARRAY2 ARRAY1 ARRAY2 PerformanceMonitor Performance Monitoring Client Disk Array LAN Operation Administrator Figure 1-1 Configuration of the Performance Monitoring Function 1

8 Chapter 1 Overview of Performance Monitoring Function 1..2 PerformanceMoniitor and Rellated Product PerformanceMonitor requires the following program product as a precondition. BaseProduct The following program product enables to utilize the performance information accumulated by PerformanceMonitor and also analyze the storage performance from different angles. PerformanceNavigator 1..3 System Confiiguratiion For system configuration when using the performance monitoring function, refer to System Configuration in the Manual Guide. 2

9 Chapter 1 Overview of Performance Monitoring Function 1..4 Operatiion of Performance Moniitoriing Functiion This section describes operations of the performance monitoring function. The performance monitoring function is operated in the flows shown below: Operation flow Reference Installing performance monitoring function Installation of the performance monitoring function is accompanied by installing ism at the same time. Chapter 2 Installation of Performance Monitoring Function Specifying targets of monitoring performance in real-time For defining the targets of monitoring performances, specify disk array, ports, logical disks, and physical disks composing logical disks used in operations requiring responsibility such as online processing. Also, specify monitoring items among those allowed for real-time monitoring (I/O Density, transfer rate, etc.). For example, to monitor responses to accesses from an application, average response time and I/O density must be monitored Displaying Load Status in Real- Time 3.1 Displaying Load Status in Real- Time Analyzing performances Accumulate the statistic information of performance monitoring target devices, with accesses from application programs. Then analyze the statistic information by summarizing, extracting, and editing. On the basis of the analyzed information, a maximum load level, load fluctuation, and expected period of heavy load and future load regulation are estimated. This analysis is performed regularly. If a problem about performances is expected, an appropriate measure must be taken in advance Supporting Statistic Information Analysis 3.3 Support for Analysis of Statistic Information Appendix A Commands of Performance Monitoring Function Specifying threshold value and monitoring overloads On the basis of performance analysis results, specify threshold values as indexes for detecting overloads. Loads exceeding a specified threshold value are detected by ism automatically, and are reported on the ism Client screen Monitoring Overloads 3.2 Monitoring Overloads Appendix A Commands of Performance Monitoring Function Continued to next page 3

10 Chapter 1 Overview of Performance Monitoring Function Operation flow Reference Continued from previous page Upon detection of overload Reviewing cause of overload Display the Performance Monitoring screen on the ism client or use the threshold operation command on the ism server to check the location of overload. Then, analyze the accumulated statistic information to determine the cause of the overload. Identifying the location of overload: Monitoring Overloads 3.2 Monitoring Overloads Appendix A Commands of Performance Monitoring Function Analyzing statistic information: Supporting Statistic Information Analysis 3.3 Support for Analysis of Statistic Information Appendix A Commands of Performance Monitoring Function Improving performance Analysis of statistic information makes it possible to improve performance as shown in the examples provided below. If there is a problem with the file arrangement and the access load concentrates in a specific logical disk, the I/O density of the logical disk should be higher than that of other logical disks and its response time should be longer. If this is the case, it is necessary to review the file arrangement and distribute the load. If a write operation onto the disk is slow, the cache memory is insufficient. A write operation onto physical disks may be simultaneously performed. This status is confirmed by checking to see if the Write Hit ratio is less than 100%. If this is the case, it is recommended that the memory of the disk array be added. If response is not quick although the access density from the application server to the logical disk is low, the access density to another logical disk on the same RANK/pool may be high. This state is confirmed by the fact that the Busy Ratio of the RANK/pool is high. In this case, use the performance optimization function to move the logical disk, which has the high access density, to another RANK/pool and level out the Busy Ratio of each RANK/pool. On the other hand, reviewing the processes of an application to reduce access operations to a disk or improving access efficiency by batch accessing can be good solutions to some cases. Against high busy ratio on RANK/pool: Performance Optimization User s Manual 4

11 Chapter 1 Overview of Performance Monitoring Function 1..5 Functiion Overviiew The performance monitoring function includes Real-Time Display of Load Status, Monitoring Overloads, and Statistic Information Analysis Supporting Diispllayiing Load Sttattus iin Reall--Tiime This function is capable of displaying the latest load state and usage of the disk array and disk array components. The information is displayed upon the ism client screen, on the real-time basis. The function, which can monitor performances of multiple disk arrays, allows centralized monitoring on the same view of one ism client. When storage performance decreases, or symptom of a trouble is seen, use this function to display the performance information of disk array and disk array components, and identify the cause of decreased performances or a fault. For details on components composing disk array, refer to the Configuration Setting Tool User s Manual (GUI) and Cache Partitioning User s Manual. The Performance Monitoring screen on the ism client is capable of displaying the index values for each component type shown in Table 1-1. Monitored Item Table 1-1 Available Combinations of Monitored Items and Component Types Component Type Disk Array Port Cache Segment Logical Disk Physical Disk External I/O Density * - External Transfer Rate * - External Average Transfer Length * - External Average Response Time * - Read Hit Ratio * - * - Write Hit Ratio * - * - Internal I/O Density Internal Transfer Rate Internal Average Transfer Length Internal Average Response Time Busy Ratio * : Items displayed *: Items displayed (some disk arrays cannot be monitored) -: Items not displayed 5

12 Chapter 1 Overview of Performance Monitoring Function Note 1: Note 2: Note 3: For the following disk arrays in which the function to collect the cache hit ratio of the whole of the disk arrays has not been installed, the read hit ratio and write hit ratio of the disk arrays cannot be monitored. S3100, S4100 * If, however, BaseProduct Ver2.1 or later (Storage Manager Ver 2.1 or later or storage control software version 170E or later) has been applied to the disk arrays above, the hit ratios can be monitored. For the following disk arrays in which the cache partitioning function or the partitioning function has not been installed, the performance information of the cache segment cannot be monitored. S100, S400, S500, S550, S1100, S1200, S1300, S1400, S1500, S1800AT, S1850AT, S2100, S2200, S2300, S2400, S2500, S3100, S4100, D1-10, D3-10 For the following disk arrays in which the function to collect busy time has not been installed, the busy ratio of physical disks cannot be monitored. S100, S1100, S1200, S1300, S2100, S2200, S2300 Displays the latest load status in numerical values Figure 1-2 Displaying the Numeric Table 6

13 Chapter 1 Overview of Performance Monitoring Function Displays the latest load state in bar graphs Figure 1-3 Displaying the Bar Graph 7

14 Chapter 1 Overview of Performance Monitoring Function Displays the latest load state in time-series graphs Figure 1-4 Displaying the Time-series Graph 8

15 Chapter 1 Overview of Performance Monitoring Function (1) Monitored Items Monitored items are types of index values which indicate status of load or performance. ism displays values of the following types of the monitored items on the ism client Performance Monitoring screen. (i) External I/O Density This is the number of input/output requests received by the disk array from the external per unit time. The unit is IOPS (Input Output Per Second). This is calculated by measuring the external I/O count during the unit measurement period and dividing it by the time interval of the measurement period. (ii) External Transfer Rate This is the Average Transfer Rate of the input/output process achieved in response to the input/output requests received by the disk array from the external. The unit is megabyte/second. This is calculated by measuring the sum of the external data transfer during the unit measurement period and dividing it by the time interval of the measurement period. (iii) External Average Transfer Length This is the average input/output data length per one input/output request received by the disk array from the external. The unit is kilobyte. This is calculated by measuring the sum of the external data transfer and external I/O count during the unit measurement period and dividing the former by the latter. (iv) External Average Response Time This is the Average Response Time for the input/output requests received by the disk array from the external. The unit is millisecond. This is calculated by measuring the total of the external response time and external I/O count during the unit measurement period and dividing the former by the latter. (v) Read Hit Ratio It is the ratio of case where the READ request has been completed using data stored in the cache without reading from disk unit (Read hit), when the disk array receives the input requests from outside. The unit is percentage [%]. It is calculated by following expression; dividing the number of cache hit I/Os by the number of receiving READ requests during the measuring interval. (vi) Write Hit Ratio This is the ratio of case where the WRITE request has been completed quickly by writing data only in the cache (Write hit), when the disk array receives the output requests from outside. The unit is percentage [%]. It is calculated by following expression; dividing the number of cache hit I/Os by the number of receiving WRITE requests during the measuring interval. (vii) Internal I/O Density This is the number of input/output requests issued to the internal disk devices by the control device of the disk array. The unit is IOPS (Input Output Per Second). This is calculated by measuring the internal I/O count during the unit measurement period and dividing it by the time interval of the measurement period. (viii) Internal Transfer Rate This is the average transfer rate of the input/output requests issued to the internal disk devices by the control device of the disk array. The unit is megabyte/second. This is calculated by measuring the sum of the internal data transfer during the unit measurement period and dividing it by the time interval of the measurement period. 9

16 Chapter 1 Overview of Performance Monitoring Function (ix) Internal Average Transfer Length This is the average input/output data length of the input/output process performed for the internal disk devices by the control device of the disk array. The unit is kilobyte. This is calculated by measuring the sum of the internal data transfer and internal I/O count during the unit measurement period and dividing the former by the latter. (x) Internal Average Response Time This is the average response time for the input/output requests issued to the internal disk devices by the control device of the disk array. The unit is millisecond. This is calculated by measuring the total of the internal response time and internal I/O count during the unit measurement period and dividing the former by the latter. (xi) Busy Ratio This is the rate of operation of physical disks. The unit is percentage (%). This is calculated by measuring the busy time of physical disks during the unit measurement period and dividing it by the time slot of measured segments. (2) Component type (i) (ii) ism separately displays values of the monitored items collected in the following units. Disk Array Statistic information of the entire disk array to be monitored is collected and load status for each disk array is reported. For this component type, the following monitored items can be reported. External I/O Density External Transfer Rate External Average Transfer Length External Average Response Time Read Hit Ratio Write Hit Ratio Port Port for host connection installed on the host director is called a host port or port. For the monitored disk arrays, statistic information related to each host port is collected separately, and load status for each host port is reported. For this component type, the following monitored items can be reported. External I/O Density External Transfer Rate External Average Transfer Length External Average Response Time In principle, the sum of the values of a monitored item over all the host ports in one disk array is equal to the sum of the values of the same monitored item over all the disk arrays. However, in a real-world situation, some errors may exist due to varied sampling time of the statistic information which is the basis of the values of the monitored item. 10

17 Chapter 1 Overview of Performance Monitoring Function (iii) Cache Segment The unit of cache memory area in the disk array segmented by the cache partitioning function is called cache segment. For the monitored disk arrays, statistic information related to each cache segment is collected separately, and load status for each cache segment is reported. For this component type, the following monitored items can be reported. External I/O Density External Transfer Rate External Average Transfer Length External Average Response Time Read Hit Ratio Write Hit Ratio (iv) Logical Disk For the monitored disk arrays, statistic information related to each logical disk is collected separately, and load status for each logical disk is reported. For this component type, the following monitored items can be reported. (Note 1) External I/O Density External Transfer Rate External Average Transfer Length External Average Response Time Read Hit Ratio Write Hit Ratio Note 1: When a monitored logical disk has been linked to an LV (link volume), the statistic information on the I/O having accessed the relevant logical disk via the LV is also added for the report. When a monitored logical disk is LV, the statistic information on the I/O having accessed via the relevant LV is collected and reported as the load status of the relevant LV. (v) Physical Disk Disk devices installed in a disk array are called physical disks. Statistic information related to each physical disk installed in the monitored disk arrays is collected separately, and load status for each physical disk is reported. For this component type, the following monitored items can be reported. Internal I/O Density Internal Transfer Rate Internal Average Transfer Length Internal Average Response Time Busy Ratio 11

18 Chapter 1 Overview of Performance Monitoring Function You can set the update frequency (Display Refresh Rate) of display on the Numeric Table and the Timeseries Graph at environment setting. You can also change the setting from the ism server menu while the ism server is operating if the performance monitoring screen is not started. For details on environment setting, refer to the installation guide. For changing Display Refresh Rate, refer to the User s Manual or User s Manual (UNIX) in accordance with your OS in use. Set the Display Refresh Rate as the number of screen updates per minute. Table 1-2 shows relation between Display Refresh Rate and Display Refresh Interval. Table 1-2 Display Refresh Rate and Display Refresh Interval Display refresh rate (times/minute) Display refresh interval (second) You cannot change the Display Refresh Rate while the Performance Monitoring screen is started. Change to the Display Refresh Rate applies to all the disk arrays monitored by the server. Increasing the Display Refresh Rate detects change in the performance information in a shorter interval but the number of components simultaneously display is decreased. This is because the number of collection of performance information by a single disk array unit in certain period is restricted not to obstruct file I/O from the application host in the overhead at collection of performance information. This tendency is eminent especially when statistic information is being stored simultaneously with real-time displaying. 12

19 Chapter 1 Overview of Performance Monitoring Function Moniittoriing Overlloads Specifying a threshold as an index value of overload allows ism to automatically detect the occurrence of overload in a disk array or a disk array component (occurrence of a load exceeding a specified threshold value). Upon detecting overload, a message notifying overload is displayed. At the same time, asterisks (**) are displayed at the location where the overload occurred on the Performance Monitoring screen. When the occurrence of overload is reported by a message, an administrator must identify the location of overload occurrence on the Performance Monitoring screen. To detect overload of the entire disk array, it is enough to set thresholds for the entire disk array, IOPS of the port, transfer rate, and average response time, and to monitor the performance. You do not have to specify a threshold for each and every logical disk and physical disk. If you need to restrict the I/O load of a specific logical disk and physical disk for some reason such as data of the database application, specify thresholds for the logical disk and physical disk. Then you can detect an abnormal load on them. Application Server Performance Monitoring Screen ARRAY1 ARRAY2 ** Overload Overload Occurrence Display ARRAY1 ARRAY2 Performance Monitor Performance Monitoring Client Disk Array LAN Operation Administrator Figure 1-5 Monitoring Overloads A threshold value is specifiable for each component type displayed by the Real-Time Display function (refer to Table 1-1). The unit of specifying a threshold is called a threshold monitoring element. Thresholds can be set using the Performance Monitoring screen of the ism client or the threshold operation command of the ism server. The threshold monitoring elements are the monitored items that can be displayed in real-time and the following items. 1. Component type: Logical disk, monitored item: Average Semi-Synchronous Ordering Buffer Waiting Time 13

20 Chapter 1 Overview of Performance Monitoring Function 2. Component type: Logical disk, monitored item: Max Semi-Synchronous Ordering Buffer Waiting Time Note 1: To set thresholds on the Performance Monitoring screen of the ism client, the user level must be L2 or L3. For details about the user levels, refer to Client Start/Stop in the User s Manual or User s Manual (UNIX) in accordance with your OS in use. Note 2: The threshold cannot be monitored on the disk array that does not support the function to monitor the threshold of the average or maximum wait time of the semi synchronous copy order guarantee buffer. Also, the ism client does not support the function to specify the threshold of the average or maximum wait time of the semi synchronous copy order guarantee buffer. Use the threshold operation command to specify the threshold. For details about how to use the wait time of the semi synchronous copy order guarantee buffer, refer to the Data Replication User s Manual (Disaster Recovery System Installation and Operation Guide). (1) Notifying threshold excess by The event link function of the ism server s a message (message ID: ism08050) to a specified address in order to notify the occurrence of a threshold excess. For details on the event link function of the ism server, refer to Event Link in the User s Manual or User s Manual (UNIX) in accordance with your OS in use. For details of messages, refer to the Messages Handbook. (2) Threshold monitoring conditions During a background process of disk array, such as batch processing and fault recovery of physical disks, a threshold value may be temporarily exceeded. Upon such a case, which can occur in usual operation, the excess of threshold should not be reported to an administrator. Specifying the monitoring conditions shown below can prevent such unnecessary reporting of the excess of threshold. 1. Threshold monitoring interval Time interval of detecting a threshold. Default value is the same as Display Refresh Interval. 2. Minimum I/O count If the number of I/Os in a threshold monitoring interval does not exceed an I/O count specified here, the threshold is not monitored in this interval. A minimum I/O count is specified with the number of I/Os per minute. Default value is 60 per minute. Threshold monitoring is performed when the number of I/Os in a threshold monitoring interval exceeds the specified minimum I/O count. If the threshold is exceeded, the excess of threshold is reported. By system operation, analyzing performances, and specifying the threshold monitoring conditions on the 14

21 Chapter 1 Overview of Performance Monitoring Function basis of the analysis, monitoring of overload appropriate for the applications can be performed. Figure 1-6 shows an outline of the threshold monitoring interval. Because of short threshold monitoring interval, excess of threshold is notified upon a temporary overload. Value of Monitored Item Threshold value Specifying 1 minute for a threshold monitoring interval Specifying 5 minutes for a threshold monitoring interval Threshold Monitoring Interval (Scale: 1 minute) Figure 1-6 Threshold Monitoring Interval For monitoring overload of a disk array, performance information must be constantly collected from the disk array. If thresholds are set for many monitoring items, collection of performance information burdens the disk array. The number of monitored items for which a threshold can be set is limited in order to prevent load on the disk array increased by collection of performance information from affecting I/O to and from the application server. Specification of thresholds for many logical disks and physical disks in a medium or large scale disk array may conflict with the above limit of monitoring items. To prevent this conflict and set thresholds without limit, set the threshold monitoring interval included in the environment definition of the ism server to the same as the logging interval. This setting enables to decrease the load on the disk array to be increased by threshold monitoring, in conjunction with accumulation of statistic information, which is described in the following section. This measure, however, requires accumulated statistic information. If the threshold monitoring interval is set to the same as the logging interval, only the disk array whose statistic information is accumulated is monitored for thresholds. Note that if accumulation of statistic information is stopped, the excess of threshold is not monitored even when thresholds are set for monitoring items. 15

22 Chapter 1 Overview of Performance Monitoring Function (3) Resetting threshold excess state Once a threshold value is exceeded, the value is excluded from threshold monitoring target until the threshold excess state is reset. This feature prevents repeated reporting of the same event of threshold excess state, under largely fluctuating loads. The threshold excess state can be reset by the Performance Monitoring screen of the ism client or the threshold operation command of the ism server. Setting the condition to reset threshold excess state allows automatic reset of threshold excess state when the condition is satisfied. The following conditions can be set for resetting the threshold excess state: 1. Time of continued values under threshold Specify the number of threshold monitoring intervals during which a value is kept under threshold. For each monitoring item satisfying the conditions, threshold excess state is reset. If the number of I/Os does not reach a minimum number of I/Os specified as a threshold monitoring condition, the load of the interval is recognized as under threshold. 2. Time of day At a specified time each day, the threshold excess state is reset for all monitoring items. Figure 1-7 shows an example of resetting threshold excess state when 3 is specified as the number of threshold monitoring intervals for a period of continuous values under threshold. Threshold Monitoring Interval Detect Threshold Exceeding Threshold Excess State Notify Threshold Excess Threshold Monitoring Intervals (3 Times) Notify Threshold Excess ism Client Figure 1-7 Resetting Threshold Excess State 16

23 Chapter 1 Overview of Performance Monitoring Function Supporttiing Sttattiisttiic IInfformattiion Anallysiis This function is capable of to accumulating, summarizing, extracting, and editing statistic information about the performances of disk array in a file. Using this function allows long-term accumulation of statistic information which lets you grasp long-term load variations and analysis of performance, for efficient use of the disk array. A file where statistic information is accumulated is called a statistic information history file. The statistic information history file is stored on the ism management server, allowing summarizing, extracting, and editing data on the server. In addition, downloading the statistic information history file allows summarizing, extracting, and editing data on an ism client. 1. Accumulating statistic information 2. Summarizing, extracting, and editing statistic information Or Disk Array Statistic Information History File PerformanceMonitor 1. Downloading accumulated statistic information 2. Summarizing, extracting, and editing statistic information ism Client Figure 1-8 Analyzing Statistic Information When statistic information has been accumulated for a long term, disk usage of the statistic information history file increases. Therefore, it is necessary to systematically organize statistic information. Increase of disk usage can be prevented by summarizing statistic information and keep period of statistic information. 17

24 Chapter 1 Overview of Performance Monitoring Function Accumullattiing Sttattiisttiic IInfforrmattiion The statistic information collected from disk array is accumulated in a statistic information history file. One statistic information history file stores the statistic information for up to one day collected from one disk array. A statistic information history file is automatically created in a directory specified by environment definition. Application Servers PerformanceMonitor ARRAY1 ARRAY2 LAN Disk Array Statistic Information History File Figure 1-9 Accumulating Statistic Information Statistic information history files are created based on the following naming conversion. Naming Convention for Statistic Information History Files: yyyymmdd Disk Array Name [#nnn].psl (i) (ii) yyyymmdd The year, month, and day when accumulation to the statistic information history file started. If date changes while statistic information is being accumulated, accumulation is done to a new statistic information history file. Disk Array Name This is the name of the disk array. Statistic information history files are created for each disk array. 18

25 Chapter 1 Overview of Performance Monitoring Function (iii) nnn This is a file serial number (between 2 and 999). If a file with the same name exists when accumulation of statistic information starts up, a serial number is assigned. For example, if the ism server is shut down and started up in operation of one day, the serial number is assigned to accumulated statistic information from the second startup of the ism server, and the value increments by one. The serial number has the upper limit. If the number exceeds this limit, accumulation of statistic information fails. To avoid it, move the statistic information history files to the different directory at each shutdown of the ism server, or summarize/extract statistic information as required, delete the statistic information history files. Then, restart the ism server. If accumulation start and stop operations are repeated without shut down and start up of the ism server, the file serial number is not assigned or incremented and accumulation of statistic information to the same file continues. For information on how to estimate the size of a statistic information history file, refer to Appendix E Estimating Size of Files for Performance Monitoring Function. The accumulating period of statistic information is called the logging interval. The user can specify the logging Interval from 1 minute to 60 minutes at environment definition of the ism server. The logging Interval cannot be changed while the ism server is operating. To change the logging Interval, you must terminate the ism server. The accumulating processes of statistic information limits the number of times for collecting statistic information within a specified time, in order not to affect I/O process from the application server. Therefore, too many disk array components may prevent collecting statistic information within a specified logging interval, and may disable starting of the data accumulation process. In such a case, specifying the automatic adjustment of logging interval in the environment definition of the ism server can adjust the appropriate intervals within a range of 60 minutes from the interval set in the environment definition, and start accumulating processes. When a logging interval is automatically adjusted, a message notifies the adjustment. The monitored disk arrays collect various types of statistic information by component/load type in the unit of summarizing. From the statistic information, ism reads the statistic information of the types shown in Table 1-3 and accumulates the time changes in the statistic information history file. Such statistic information is called basic statistic information. The information output on a specific resource basis is called additional statistic information, and is described in the form of resource-name (additional-information). ism also records information required for displaying the following information in the statistic information history file. Component information required interpreting accumulated statistic information Name tags used for displaying the results of analysis 19

26 Chapter 1 Overview of Performance Monitoring Function Table 1-3 Types of Statistic Information Accumulated in Statistic Information History Files (100 Series) Statistic Information Type/Load Type Host Port Disk Port Component Type Logical Disk (Note 1) Physical Disk (Note 1) Pool (Notes 1, 2) Write WriteHit External I/O Count Read ReadHit PrefetchHit Others Write WriteHit External Average Response Time Read ReadHit PrefetchHit Others Write WriteHit External Maximum Response Time Read ReadHit PrefetchHit Others Write WriteHit External Transfer Rate Read ReadHit PrefetchHit Others Internal I/O Count Internal Average Response Time Internal Maximum Response Time Internal Transfer Rate Write - - * Read - - * Write - - * Read - - * Write - - * Read - - * Write - - * Read - - * Average Busy Ratio * * * Busy Time * * : Can be monitored *: Can be monitored (some disk arrays cannot be monitored) -: Cannot be monitored 20

27 Chapter 1 Overview of Performance Monitoring Function Note 1: Note 2: For the following disk array in which the function to collect busy time has not been installed, the average busy ratio and busy time are not accumulated in the statistic information history file. S100 For the following disk array without pool, the pool statistic information is not accumulated in the statistic information history file. S100 21

28 Chapter 1 Overview of Performance Monitoring Function Table 1-4 Types of Statistic Information Accumulated in Statistic Information History Files (1000 Series) Statistic Information Type/Load Type Host Port Replication Port (Note 4) Disk Port Component Type Logical Disk (Note 1) Physical Disk (Note 1) RANK (Notes 1, 2, 3) Pool (Notes 1, 2) Write * WriteHit - * External I/O Count Read * ReadHit - * PrefetchHit Others Write * External Average Response Time WriteHit - * Read * ReadHit - * PrefetchHit Others Write * External Maximum Response Time WriteHit - * Read * ReadHit - * PrefetchHit Others Write * WriteHit - * External Transfer Rate Read * ReadHit - * PrefetchHit Others Internal I/O Count Internal Average Response Time Write * * Read * * Write * * Read * * Internal Write * * Maximum Response Time Read * * Internal Transfer Rate Average Busy Ratio Write * * Read * * * * * * Busy Time * * * : Can be monitored *: Can be monitored (some disk arrays cannot be monitored) -: Cannot be monitored 22

29 Chapter 1 Overview of Performance Monitoring Function Note 1: Note 2: Note 3: Note 4: For the following disk arrays in which the function to collect busy time has not been installed, the average busy ratio and busy time are not accumulated in the statistic information history file. S1100, S1200, S1300 For the following disk arrays without pool, the RANK and pool statistic information is not accumulated in the statistic information history file. S1100, S1200, S1300 For disk arrays with pool, the RANK statistic information is not accumulated in the statistic information history file. The target disk arrays are as follows. S1400, S1500, S1800AT, S1850AT For the following disk arrays for which the remote data replication function has not been supported, the replication port statistic information is not accumulated in the statistic information history file. S1100, S1200, S

30 Chapter 1 Overview of Performance Monitoring Function Table 1-5 Types of Statistic Information Accumulated in Statistic Information History Files (2000 Series) Statistic Information Type/Load Type Host Port Replication Port (Note 4) Disk Port Component Type Logical Disk (Note 1) Physical Disk (Note 1) RANK (Notes 1, 2, 3) Pool (Notes 1, 2) Write * WriteHit - * External I/O Count Read * ReadHit - * PrefetchHit Others Write * WriteHit - * External Average Response Time Read * ReadHit - * PrefetchHit Others Write * WriteHit - * External Maximum Response Time Read * ReadHit - * PrefetchHit Others Write * WriteHit - * External Transfer Rate Read * ReadHit - * PrefetchHit Others Internal I/O Count Write * * Read * * Internal Write * * Average Response Time Read * * Internal Write * * Maximum Response Time Read * * Internal Transfer Rate Write * * Read * * Average Busy Ratio * * * * Busy Time * * * : Can be monitored *: Can be monitored (some disk arrays cannot be monitored) -: Cannot be monitored 24

31 Chapter 1 Overview of Performance Monitoring Function Note 1: Note 2: Note 3: Note 4: For the following disk arrays in which the function to collect busy time has not been installed, the average busy ratio and busy time are not accumulated in the statistic information history file. S2100, S2200, S2300 For the following disk arrays without pool, the RANK and pool statistic information is not accumulated in the statistic information history file. S2100, S2200, S2300 For disk arrays with pool, the RANK statistic information is not accumulated in the statistic information history file. The target disk arrays are as follows. S2400, S2500 The following disk arrays in which the remote data replication function has not been supported, the replication port statistic information is not accumulated in the statistic information history file. S2100, S2200, S

32 Chapter 1 Overview of Performance Monitoring Function Table 1-6 Types of Statistic Information Accumulated in Statistic Information History Files (2800 Series) Statistic Information Type/Load Type Host Port Replication Port Disk Port Component Type Cache Segment Logical Disk Physical Disk Write Pool WriteHit External I/O Count Read ReadHit PrefetchHit Others Write WriteHit External Average Response Time Read ReadHit PrefetchHit Others Write WriteHit External Maximum Response Time Read ReadHit PrefetchHit Others Write WriteHit External Transfer Rate Read ReadHit PrefetchHit Others Internal I/O Count Internal Average Response Time Internal Maximum Response Time Internal Transfer Rate Write Read Write Read Write Read Write Read Average Busy Ratio Busy Time : Can be monitored -: Cannot be monitored 26

33 Chapter 1 Overview of Performance Monitoring Function Table 1-7 Types of Statistic Information Accumulated in Statistic Information History Files (3000 Series) Statistic Information Type/Load Type Host Port Replication Port (Note 3) Disk Port Component Type Cache Segment (Note 2) Logical Disk Physical Disk Write * - * - - WriteHit - * - * - - RANK (Note 1) External I/O Count Read * - * - - ReadHit - * - * - - PrefetchHit * - - Others Write * - * - - WriteHit - * - * - - External Average Response Time Read * - * - - ReadHit - * - * - - PrefetchHit * - - Others Write * - * - - WriteHit - * - * - - External Maximum Response Time Read * - * - - ReadHit - * - * - - PrefetchHit * - - Others Write * - * - - WriteHit - * - * - - External Transfer Rate Read * - * - - ReadHit - * - * - - PrefetchHit * - - Others Internal I/O Count Write * Read * Internal Write * Average Response Time Read * Internal Write * Maximum Response Time Read * Internal Transfer Rate Write * Read * Average Busy Ratio * Busy Time : Can be monitored *: Can be monitored (some disk arrays cannot be monitored) -: Cannot be monitored 27

34 Chapter 1 Overview of Performance Monitoring Function Note 1: Note 2: Note 3: For the following disk array without pool, the RANK and pool statistic information is not accumulated in the statistic information history file. S3100 * If, however, the latest storage control software has been installed in S3100, the RANK statistic information is accumulated in the statistic information history file. For the following disk array in which the cache partitioning function has not been installed, cache segment statistic information is not accumulated in the statistic information history file. S3100 The following disk array for which the remote data replication function has not been supported, the replication port statistic information is not accumulated in the statistic information history file. S3100 * If, however, the latest storage control software has been installed in S3100, the information is accumulated in the file. 28

35 Chapter 1 Overview of Performance Monitoring Function Statistic Information Type/Load Type Table 1-8 Types of Statistic Information Accumulated in Statistic Information History Files (4000 Series) Host Director (Note 5) Disk Director (Note 5) Host Port Replication Port (Note 4) Disk Port Component Type Cache (Note 6) Cache Segment (Notes 2, 6) Logical Disk Physical Disk RANK (Notes 1, 3) Pool Semi Synchronous Copy Order Guarantee Buffer Information (Note 7) Write - - * - - * WriteHit * - - * External I/O Count Read - - * - - * ReadHit * - - * PrefetchHit * Others Write - - * - - * External Average Response Time WriteHit * - - * Read - - * - - * ReadHit * - - * PrefetchHit * Others Write - - * - - * External Maximum Response Time WriteHit * - - * Read - - * - - * ReadHit * - - * PrefetchHit * Others Write - - * - - * WriteHit * - - * External Transfer Rate Read - - * - - * ReadHit * - - * Internal I/O Count Internal Average Response Time Internal Maximum Response Time PrefetchHit * Others Write * * - Read * * - Write * * - Read * * - Write * * - Read * * - Internal Write * * - Transfer Rate Read * * - 29

36 Chapter 1 Overview of Performance Monitoring Function Statistic Information Type/Load Type Average Busy Ratio Average Queue Length Max Queue Length Average Dirty Pages (%) Max Dirty Pages (%) Busy Time - Whole Setting Amount ATgroup Setting Amount Current Size Host Director (Note 5) Disk Director (Note 5) Host Port Replication Port (Note 4) Disk Port Component Type Cache (Note 6) Cache Segment (Notes 2, 6) Logical Disk Physical Disk RANK (Notes 1, 3) Pool Semi Synchronous Copy Order Guarantee Buffer Information (Note 7) - * * * * * * * * * - - * * * * * * * * * * * Max Size * : Can be monitored *: Can be monitored (some disk arrays cannot be monitored) -: Cannot be monitored 30

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