Backup and restore best practices for an Enterprise SQL Server 2008 Data Warehouse: HP XP24000 storage, ProLiant DL785 server and Symantec NetBackup

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1 Backup and restore best practices for an Enterprise SQL Server 2008 Data Warehouse: HP XP24000 storage, ProLiant DL785 server and Symantec NetBackup Table of contents Introduction... 3 Why performing fast backup is important... 3 Online versus offline backup... 4 Configuration and settings... 5 Configuration layout... 5 HP ProLiant DL785 G5 running SQL Server Configuration... 6 Host bus adaptors... 7 Windows Server setup... 7 Operating system... 7 Instant file initialization... 7 HP StorageWorks XP24000 Disk Array... 7 HP StorageWorks Enterprise Systems Library... 8 Description... 8 Firmware... 9 Cabling... 9 Host Access... 9 HP StorageWorks MSA SQL Server setup SQL Server Edition SQL Server installation Database layout NetBackup installation and configuration Installation Configuration Monitoring infrastructure HP StorageWorks XP Performance Advisor Windows Reliability and Performance Monitor XP SVP (service processor) SQL Server backup and restore Database backup Database restore Parameters Buffer space Reporting Backup Restore Baseline testing... 20

2 Disk drives Read performance on the source Write performance on the target (backup) Tape drives SQL Server backup command SQL Server backup to NULL Influence of the buffercounts Influence of the backup compression to NULL SQL Server backup/restore to tape SQL Server backup MSA volumes SQL Server restore MSA volumes Backup and restore behind the scene Summary NetBackup for SQL Server NetBackup SQL Agent installation and settings Installation NetBackup SQL policy Parallelism Initiate SQL Server backup and restore by using NetBackup Agent NetBackup MS SQL Client GUI SQL backup by using NetBackup Introduction Backup command generated by NetBackup Back up to disks setting disk drives Backup to tapes settings LTO3 tape drives Impact of the compression Back up to tape with NetBackup Performance summary Back up to disks with NetBackup performance summary Other consideration Restore by using NetBackup Introduction Restore from tapes Restore from disks Best practices Database administrators Location of SQL Server binaries Planning for file groups Set up transaction log TEMPDB Server administrators Monitor server workload Windows Instant File Initialization Storage administrators Monitor XP/MSA performance Backup administrators Symantec NetBackup Select the correct target backup device Perform incremental backups to save time and space Summary Appendix A Bill of materials For more information Feedback... 49

3 Introduction Microsoft SQL Server 2008 backup and recovery operations are critical activities. With missioncritical data warehouse workloads, the ability to back up and recover your data within the specified backup window is vital. This paper discusses the backup-recovery of an enterprise class data warehouse by using various backup and recovery methodologies. To help you choose from the available configuration options and backup and recovery procedures, HP conducted extensive laboratory tests to determine best practices. This paper discusses those test results so that users can understand the options and the limitations of implementing backup and recovery by using Linear Tape-Open (LTO) tape and disk-to-disk devices. The audience for this paper is HP users in an enterprise environment currently running or planning to run SQL Server The paper includes: Best practice recommendations for configuration, design, and deployment Backup and recovery recommendations to integrate Symantec NetBackup and Microsoft SQL Server 2008 Impact on database performance and throughput for LTO tape and disk-to-disk General recommendations for selecting backup and recovery methods Supporting configuration recommendations for HP servers and for HP StorageWorks XP24000 disk array By leveraging the recommendations and best practices, administrators can shorten backup windows and efficiently load the server, which reduces costs and maximizes hardware use and personnel resources. Why performing fast backup is important Figure 1 shows the impact of the backup on a query response time. The response time is multiplied by four when the backup is in progress. Even if the database stays online during the backup, it is going to be difficult to maintain the quality of service expected. 3

4 Figure 1. Impact of the backup on a query response time 1:04:48 0:57:36 0:50:24 0:43:12 0:36:00 0:28:48 0:21:36 0:14:24 0:07:12 0:00:00 Ref (Query) Ref (Backup) Both Query Response time Backup time The faster the backup can be processed, the easier it is for the administrator to provide the required performance. Online versus offline backup There are several obvious advantages for performing online backups of SQL databases with the backup and restore API). First, when full backups are performed, it guarantees that all data files and log files required are available in case of restore. It guarantees consistency from the transaction standpoint. It also provides more granularity for the restore (database, file group, and data page). Transaction log backup and file-group backup are supported. Using offline backup (for example, operating system level backup), might cause the following issues: Incomplete backup due to missing files Inconsistent backup, backup occurs when SQL is running Point-in-time restore is not doable Full backup is required 4

5 Configuration and settings The data provided in this document is gathered by using HP server, storage, and software products along with SQL Server This section describes the infrastructure deployed for this project, and the recommended configuration guidelines for a data warehouse on the XP Each component is presented in detail and includes the following: The SQL server and the management servers The storage subsystem Configuration layout Figure 2 shows the configuration implemented for this project and includes the following components. Database server running SQL Server 2008 on an HP ProLiant DL785 G5 server (1) HP StorageWorks XP24000 Disk Array (1) HP StorageWorks 2000fc Modular Smart Array (MSA2000fc) Disk Array (2) HP ESL 712e Tape Library (1), with Fibre Channel LTO3 tape drives (4) Backup server running on an HP ProLiant DL380 G5 server (1) Management servers (2) 5

6 Figure 2. Configuration layout HP ProLiant DL785 G5 running SQL Server 2008 Configuration The HP ProLiant DL785 G5 is an eight socket server based on the AMD Opteron processor. The server used for this testing is configured with 8 quad core processors (2.5 GHz) and 256 GB of RAM. 6

7 Host bus adaptors The server is configured with six 8-Gb dual-channel HP StorageWorks 82E PCI-e Fibre Channel host bus adapter (HBA). Drivers For this HBA, we use the Storport driver 2-10a7-1e driver. Our test configuration also includes Windows Multipath IO (MPIO) and Device Specific Module (DSM) for XP. Link speed Since the XP24000 and the MSA2000 host ports are 4-Gb ports, the link speed on the HBA is forced to 4 Gb. Topology is set to fabric. Management The Emulex management tool HBAnyware is used to set up and configure the HBAs on both servers. Windows Server setup Operating system Microsoft Windows Server 2008 Enterprise Edition for Extended System (x64) is deployed on this server. Instant file initialization Operations such as creating a database, adding files to an existing database, or restoring a database require some file initialization. This process causes these operations to take longer. In SQL Server, data files can be initialized instantaneously. This allows for fast execution of the previously mentioned file operations. Instant file initialization reclaims used disk space without filling that space with zeros. Instead, disk content is overwritten as new data is written to the files. Log files cannot be initialized instantaneously. To enable instant file initialization, the SQL Server service account must be granted SE_MANAGE_VOLUME_NAME. Note As reported in the SQL Server ERRORLOG, the log file is always initialized even if Instant File Initialization is turned on: :09:28.06 spid54 Zeroing completed on X:\1\Option3\tpch3000gcp.ldf HP StorageWorks XP24000 Disk Array The HP StorageWorks XP24000/XP20000 Disk Array is a large, enterprise-class storage system designed for organizations that cannot afford any downtime. The XP mitigates the risk of business downtime by providing complete hardware redundancies, hot-swappable components, and nondisruptive online upgrades. Figure 3 shows how the sixteen array groups (eight disks each) were configured on the array. Each array group had three LDEVs defined. 7

8 Figure 3. XP24000 Disk Array group layout For more details about the XP layout, see the SQL 2008 Data Warehouse best practices for HP XP24000 Storage, HP ProLiant DL785 G5 Server and HP Integrity rx8640 Server white paper at HP StorageWorks Enterprise Systems Library Description The family of HP StorageWorks Enterprise Systems Library (ESL) E-series Tape Libraries offers best-inclass drive and cartridge densities. In a single cabinet, ESL can scale up to 1,139 TB of compressed (2:1) storage capacity with a transfer rate of up to 20.7 TB/hr compressed (2:1). The ESL achieves drive densities up to 109 TB of compressed (2:1) storage capacity per square foot. The ESL can be managed as a single library with up to five frames. The HP StorageWorks ESL that we evaluate includes the following components: LTO3 Ultrium tape drives (4) Slots (712) Figure 4 shows the specifications of the tape library. 8

9 Figure 4. ESL 712e settings Firmware The ESL is configured with the following firmware revisions: Robotic: Tape Drives: L67W Cabling Figure 5 shows the cabling of the HP ESL connected to the Storage Area Network. As presented, the HP ESL has two fabric ports that are used to connect to SAN. For more information about setting up and configuring the ESL 712e, see the HP StorageWorks Enterprise Backup Solutions (EBS) overview and features at Figure 5. HP ESL cabling Host Access When using HP StorageWorks Command View for TL, the tape drive and the robotic are presented to the host HBAs, as shown in Figure 6. As a result, all of the paths are used and the available bandwidth increases. 9

10 Figure 6. ESL Host Access Figure 7 shows the ESL devices in the server device manager comprised of four tape drives and the tape library (robotic). Figure 7. ESL devices in the server device manager HP StorageWorks MSA2000 The MSA2000c features a high-performance 4 Gb Fibre Channel connected array. It allows you to grow the storage capacity up to 27 TB SAS or 60 TB SATA and supports up to 64 hosts for Fibre Channel attachment. 10

11 The configuration includes the following components: Dual controllers MSA2212fc (2) Additional drive enclosures (3 per MSA) 300 GB, 15 K Dual Port SAS disks (48 disks per MSA) Disks for the two MSA (96 total), which means 28.8 TB of raw storage The MSAs are configured as follows: RAID 5 Virtual Disk (vdisk) (4) per MSA exposed through the two controllers (2 vdisks per controller) Disks (12 per vdisk) Volume (1 per vdisk) Figure 8 shows the vdisk configuration. Figure 8. Vdisk configuration The eight volumes are presented to the database server and formatted by using the following parameters: NTFS format 64 K cluster size Default partition alignment Figure 9 shows how the MSA volumes are mounted on the SQL Server. 11

12 Figure 9. MSA volumes mounted on the SQL Server SQL Server setup SQL Server Edition We use SQL Server 2008 Enterprise Edition Build x64 (ProLiant DL785) for this project. SQL Server installation The installation of SQL Server is straightforward. The default instance is used, because only one instance is installed on the server. The authentication mode is set to Windows and SQL Server. The binaries of SQL Server are stored on the C: drive. Note You can specify the TEMPDB location during the installation. Backup and restore do not generate loads in TEMPDB. TEMPDB should be configured based on the application workload. Database layout We use a typical warehouse star schema database for this project that includes the following: One-fact table Multiple dimension tables The data warehouse database size is approximately 4.5 TB and is based on two file groups: LINEITEM, which is the container for the LINEITEM table (fact table) GENERAL, which is the container for the dimension tables We use 32 files per file group. This corresponds to one data file per CPU core, which is a SQL Server best practice. This eases the storage re-layout, allowing more flexibility without having to regenerate the 4.5 TB database. Microsoft recommends multiple files in the file groups to avoid PFS (Page Free Space) contentions and because they are needed to stripe multiple storage volumes. However, the recovery time may be impacted as the file recovery is processed sequentially, (for example, one file after the other). To limit the scope of the project, we do not consider tests with a different number of files per file group in this project. 12

13 Note The same number of files is used for TEMPDB. Figure 10 depicts the data file layout. Figure 10. Data file layout NetBackup installation and configuration Installation We use NetBackup for this project. For more details regarding the installation of NetBackup, see the NetBackup Installation Guide for Windows. The NetBackup topology for this project includes two nodes: the Master Server and the Media Server. In this project, the Master Server runs on the HP ProLiant DL380 G5, and it does not dispose to any backup devices. The Media Server is installed on the HP ProLiant DL785 G5 (SQL Server). The Media Server has two backup target devices types: the disks (MSA) and the tape drives (ESL). The NetBackup Client and the SQL Agent are automatically installed on the Master and the Media Servers. Configuration The configuration includes the following steps. 1. Configure the target devices on the Media Server. o Tapes library o Disks drives 2. Configure the Client 13

14 Tape library storage unit The tape library is defined in NetBackup by using a Wizard. It allows you define the Robot Type and the technology of the tape drives. Figure 11 shows the tape library configuration. Figure 11. Tape library configuration 14

15 Disk Storage Unit Figure 12 shows the MSA volumes configured as disk storage units in NetBackup. Figure 12. Storage Unit configuration Client-Media server To target the local devices (tape drives or disks), the NetBackup client (SQL Server) properties must be changed. The default Media Server must be set with the host name of the SQL Server (see Figure 13). This way, the backup streams do not go through the network but instead, use the local devices to perform the backup and the restore. Figure 13 shows the NetBackup Client properties for the SQL Server. 15

16 Figure 13. NetBackup Client Properties for the SQL Server Figure 14 shows what the NetBackup topology looks like when configured. The tape drives are physically attached to the dl785g5-1. The robotic is also physically attached to the SQL Server but controlled by the master server (backup) Figure 14. NetBackup topology Monitoring infrastructure HP StorageWorks XP Performance Advisor The HP StorageWorks XP Performance Advisor Software is a web-based application that allows you to collect and monitor real-time performance data from the HP StorageWorks family of XP disk array products. The simple browser-based interface of XP Performance Advisor Software allows you to customize performance data collection and set performance alarms. We use XP Performance Advisor for this project. 16

17 Windows Reliability and Performance Monitor Windows Reliability and Performance Monitor is a Microsoft Management Console (MMC) snap-in that combines the functionality of previous stand-alone tools, including Performance Logs and Alerts, Server Performance Advisor, and System Monitor. It provides a graphical interface for customizing performance data collection and Event Trace Sessions. Both XP Performance Advisor and Windows Reliability and Performance Monitor are run on the same server. XP SVP (service processor) The XP SVP changes the XP configuration from RAID 5 to RAID 1. It is also used for advanced performance monitoring. The XP SVP runs on a dedicated server within the XP disk array. Note The SVP console is limited to qualified XP Service Professionals. 17

18 SQL Server backup and restore The SQL Server database engine includes backup and restore capabilities that can be initiated either by using the T-SQL backup/restore commands (with command line or with SQL Server Management Studio) or through the backup and restore API exposed by SQL Server. The NetBackup SQL Agent uses this API to perform the backup and the restore of SQL databases. Figure 15 presents the SQL Server VDI API. For more information, see the SQL Server Books online. Figure 15. SQL Server VDI API Database backup The scope of the backup with SQL Server can include one of the following items. The entire database A set of files/file groups SQL Server supports full or differential backups. A full database backup represents the entire database at the time of the backup finished. A differential database backup contains the data extents that were modified since the most recent database backup. Partial backup is a full backup of the targeted file groups or files. Differential backup are available as well for partial backups. Database restore SQL server support different restore levels: The database The data file The page In this project, only full backup and full restore of the entire database are considered. Parameters The backup and the restore can be initiated either by using SQL Server Management Studio or the command line. The command line gives more options to tune and optimize the backup/restore. 18

19 BLOCKSIZE is the size, in bytes, that is used as the device BLOCKSIZE. All data transfers are in integral multiples of this value. Values must be a power of two between 512 bytes and 64 KB inclusive. If this option is not specified with the command, then a default number of 512 bytes is used. BUFFERCOUNT is the total number of buffers (of size MAXTRANSFERSIZE) that is used by the BACKUP or RESTORE operation. When more than one virtual device is used, the buffers are used as needed and are not associated with any given device. Note Smaller buffers may be used by SQL Server to handle the small metadata transfers. These small buffers are not included in the BUFFERCOUNT. MAXTRANSFERSIZE is the size, in bytes, of the maximum input or output request which is issued by SQL Server to the device. The MAXTRANSFERSIZE must be a multiple of 64 KB. The range is from 64 KB through 4 MB. If this option is not specified with the command, a default of 64 KB is used BUFFERCOUNT and MAXTRANSFERSIZE determine the total buffer space the backup process that is available. By using some trace flags, additional information is displayed in the SQL ERRORLOG. The following command shows how to enable the trace flags: dbcc traceon(3605,3004,3014,3213,-1) Buffer space The following scenarios present the buffer space assigned by SQL Server: Scenario 1: no parameters o BufferCount: 69 o MaxTransferSize: 1,024 KB o Total buffer space: 69 MB Scenario 2: o BufferCount: 250 o MaxTransferSize: 4,096 KB o Total buffer space: 1,000 MB Total Buffer Space = BufferCount * MaxTransfersize Reporting SQL Server backups are recorded in MSDB, a system database. Note that both SQL native backups and VDI backups are reported. Backup The following T-SQL command generates a report showing the backup history. SELECT * FROM msdb.dbo.backupset Backup_set_id Backup_start_date Backup_finished_date Compatibility level Database name Server name Compressed_backup_size 19

20 Megabytes per second Restore The following T-SQL command generates a report showing the restore history. select * from msdb.dbo.restorehistory Baseline testing To optimize the backup configuration, it is important to determine the capabilities of the different components involved in a backup or a restore operation. This includes the source and the target devices. During a backup, the source is the XP disks that contain the SQL database. The target is either the disks (MSA2000) or the four LTO 3 tape drives. For a restore, the source is either the MSA2000 or the tape drives. The XP disks are the target. Disk drives Read performance on the source When using synthetic workload, the source LUNs are evaluated to measure the read performance. Figure 16 show the MB/s measured with different I/O size. Figure 16. Influence of the I/O size on the read performance K 1024k 2048K 4096k Write performance on the target (backup) When using synthetic workload, the target LUNs are evaluated to measure the write performance. Table 1 lists the measured MB/s. 20

21 Table 1. MSA2000 write performance MSA2000 Target Profile R/W ratio I/O size Eight volumes (12 disk drives per volume) Sequential 100% write 1,024 k MB/s 1,384 Tape drives The performance of the tape drives is evaluated by using HP StorageWorks Library and Tape Tools (LTT). Figure 17 shows the performance of one of the LTO3 drives. To download LTT, see the HP StorageWorks Library and Tape Tools overview and features website located at Figure 17. HP StorageWorks library and tape tools Each tape drive is evaluated individually. Table 2 lists the performance per drive and the profile of the test. 21

22 Table 2. LTO3 tape drive performance Drive 1 Drive 2 Drive 3 Drive 4 Write 8 GB 8 GB 8 GB 8 GB Block size 64 KB 64 KB 64 KB 64 KB I/O size 1 M 1 M 1 M 1 M Compression ratio 2:1 2:1 2:1 2:1 151 MB/s 152 MB/s 152 MB/s 152 MB/s SQL Server backup command As previously mentioned, a backup command is available with SQL Server to perform backups without any third-party software. With this command, a specific database can be backed up to the specified target devices. A NULL device can be used as a target to measure the performance of the source devices. Using NULL is a good way to size the target devices. SQL Server backup to NULL The following command shows how to use NULL device with the BACKUP statement. BACKUP DATABASE [tpch3000gcp] TO DISK='NUL' WITH COMPRESSION, NOFORMAT, NOINIT, NAME = N'tpch3000gcp-Full Database Backup', SKIP, NOREWIND, NOUNLOAD, STATS = 10 GO Figure 18 shows the Transfer Rate measure during a backup operation targeting NULL devices. It reports an average of 1,100 MB/s. Figure 18. Transfer rate during a backup to NULL Influence of the buffercounts Buffercount is a parameter that can be used in the SQL Backup command to increase the performance of the backup. Figure 19 shows how the value of this parameter impacts the performance of the backup. For this evaluation, the target device is set to NULL. 22

23 Backup duration (HH:MM:SS) Backup duration (HH:MM:SS) Figure 19 Influence of the buffercounts on backup performance 1:04:48 0:57:36 0:50:24 0:43:12 0:36:00 0:28:48 0:21:36 0:14:24 0:07:12 0:00:00 Default Buffercounts Influence of the backup compression to NULL Backup compression is introduced in SQL Server The purpose of the test is to measure the impact of the compression when the backup is targeting NULL devices Figure 20. Figure 20. Influence of the compression on backup performance 0:43:12 0:36:00 0:28:48 0:21:36 0:14:24 0:07:12 0:00:00 No compression Compression Compression increases the backup duration and the CPU use when targeting NULL devices. Note The NetBackup SQL Agent is not able to take advantage of the built in compression capability provided with SQL server The NetBackup agent has its own compression mechanism. SQL Server backup/restore to tape SQL Server cannot manage the robotic of the tape library. For this evaluation, we preloaded tapes in the four LTO3 tape drives. SQL used them as if there were standalone drives. As the average capacity of a LTO3 tapes is 800GB (that is if the data can be compressed at 2:1), four tapes were not 23

24 Duration (HH:MM:SS) sufficient to store the entire database (4.5 TB). Manual tape unloads and loads were required during this test. Command View for TL was used for this operation. BACKUP DATABASE [tpch3000gcp] TO tape='\\.\tape0',tape='\\.\tape1',tape='\\.\tape2',tape='\\.\tape3' WITH COMPRESSION,FORMAT, NAME = N'tpch3000gcp-Full Database Backup', SKIP, NOREWIND, NOUNLOAD, STATS = 10 Note NetBackup services might lock the tape drives. This test can be done only if NetBackup is not installed or if the services are stopped. Table 3 lists the measured results. The best performance is obtained with compression ON, the buffercount set to 250, and with Maxtransfersize set to 4 MB. Table 3. Backup duration to tape # of tapes Compression Buffercount Max transfers size (reads) Duration (HH:MM:SS) 4 on default default (256k) 1:53:25 4 on 250 4MB 1:38:48 4 off 250 4MB 1:53:45 Figure 21 shows backup and restore duration with SQL Server native command. Figure 21. SQL Server native backup and restore duration 4:19:12 3:50:24 3:21:36 2:52:48 2:24:00 1:55:12 1:26:24 0:57:36 0:28:48 0:00:00 Backup Restore No compression Compression 24

25 SQL Server backup MSA volumes Table 4 lists the backup duration for the different backup tests targeting the MSA2000 volumes. In this scenario, eight target backup files are used. Table 4. Backup duration to MSA2000 volumes Compression Buffercount Max transfer size Duration (HH:MM:SS) MB/s ON Default Default 0:53:13 1, ON Default 4 MB 0:50:17 1, ON 250 Default 0:49:35 1, ON MB 0:46:53 1, ON MB 0:48:33 1, OFF Default Default 0:53:27 1, OFF MB 0:49:39 1, SQL Server restore MSA volumes Figure 22 shows the performance of the backup and restore when targeting the MSA volumes. Note To evaluate the impact of the performance, a test is performed with 16 targets (two targets per MSA volume). As reported, having more targets decreases the backup duration. Restore duration is not impacted by the number of targets nor by the compression. 25

26 Backup/Restore duration (HH:MM:SS) Figure 22. Backup and restore performance with SQL native backup commands 0:57:36 0:50:24 0:43:12 0:36:00 0:28:48 0:21:36 0:14:24 0:07:12 0:00:00 Compression (8 targets) Compression (16 targets) No Compression (8 targets) Backup Restore Backup and restore behind the scene Behind the scenes, interesting events take place during the backup and the restore operations. When monitoring the data file access, all 64 files (32 files per file group) are concurrently read or written at the beginning of the backup or restore process. Also, some files are processed faster than the others and are completely backed up or restored much earlier. As a consequence, the load on the volumes is not homogeneous during the backup and the restore. The Total Write Bytes/s during a restore is relatively linear as opposed to the load on each volume (see Figure 23). 26

27 Figure 23. Volume-write activities during a restore Summary Figure 24 shows the performance measured during the configuration assessment. In our configuration, the source (XP Array) can deliver a higher data rate than the write rates on the targets (MSA2000 and LTO3 tape drives). Note While backing up to NULL device, the best performance measured with SQL Server is much lower than the raw read throughput we get from the array with synthetic load. 27

28 Figure 24. Summary of the assessment NetBackup for SQL Server 2008 NetBackup SQL Agent installation and settings Installation The SQL Agent is automatically installed with the NetBackup Client Agent. NetBackup SQL policy A SQL database can be backed up by using a NetBackup policy. A new policy must be defined with the following parameters: Policy type: MS-SQL-Server Policy storage unit Policy volume pool A Schedule o o Type of Backup: Application or Automatic Media multiplexing Client name: the SQL Server name Backup Selection: the name of a SQL Script stored on the SQL Server o This script defines: o The target database(s) o o o The number of stripes The buffers per stripe The block size (read) 28

29 The script can be automatically generated by using the NetBackup MS SQL Client GUI. When using this tool, you can either start the backup/restore or store the script file that is then specified in the SQL policy. Figure 25 shows a NetBackup policy for a SQL server. Figure 25. SQL policy configuration Parallelism The media multiplexing is defined on the policy. The settings of the target backup devices must be adjusted accordingly. Backup devices (Storage Unit) parallelisms Tape drives: backup targeting simultaneously multiple tape drives o o Enable or disable Multiplexing Streams per drive Multiplexing: multiple streams per drive o Maximum concurrent job The properties of the Master Server might need to be changed to increase the number of jobs per client. 29

30 Figure 26. Master server properties Initiate SQL Server backup and restore by using NetBackup Agent SQL backup can be initiated either by using the NetBackup MS SQL Client GUI or by using a NetBackup SQL Policies. NetBackup MS SQL Client GUI SQL Server connection To connect to the SQL Server backup API, the NetBackup agent requires the SQL credentials. These credentials are defined in the SQL Server connection properties (see Figure 27). 30

31 Figure 27. SQL Server connection properties SQL Server backup Figure 28 shows the backup objects (for example, the databases and file groups) that the NetBackup client can back up once it is connected to the SQL Server instance. Figure 28. Backup objects Set NetBackup client properties The client properties must be configured with the NetBackup server name and with additional parameters that are passed to SQL Server Backup API. 31

32 Figure 29. NetBackup client agent parameters Sample of script file The settings must be stored to automate the backup process. The following example displays a script file describing a job of a full backup of the tpch3000gcp database. This script is stored locally on the SQL Server. OPERATION BACKUP OBJECTTYPE FILEGROUP DATABASE tpch3000gcp FILEGROUP $ALL SQLHOST DL785G5-1 NBSERVER BACKUP STRIPES 20 MAXTRANSFERSIZE 6 BLOCKSIZE 7 POLICY SQL NUMBUFS 2 ENDOPER TRUE MAXTRANSFERSIZE 6 corresponds to 4 MB BLOCKSIZE 7 corresponds to 64 KB SQL backup by using NetBackup Introduction As NetBackup SQL Agent uses the backup and restore API (VDI) provided by SQL Server, all of the SQL NetBackup backups are reported in the SQL server system database. Backup command generated by NetBackup The backup command generated by the NetBackup agent can be trapped by using Microsoft SQL Server Profiler. The following command is equivalent to four stripes with 4 MB (MAXTRANSFERSIZE) and 32 as Client Buffers per DBMS stripe captured with SQL Profiler. Block size is set to 64 KB. 32

33 backup database "tpch3000gcp" to VIRTUAL_DEVICE='VNBU ', VIRTUAL_DEVICE='VNBU ', VIRTUAL_DEVICE='VNBU ', VIRTUAL_DEVICE='VNBU ' with stats = 10, blocksize = 65536, maxtransfersize = , buffercount = 128 The buffercount value is set based on the following formula: Buffercount = # of stripes * Client Buffers per DBMS stripe The stripe is equivalent to a VDI stream. Back up to disks setting disk drives To improve the performance of the backup when targeting disks devices, advanced parameters must be defined. You must create the file SIZE_DATA_BUFFERS_DISK. C:\Program Files\Veritas\NetBackup\db\config\SIZE_DATA_BUFFERS_DISK: Backup to tapes settings LTO3 tape drives To improve the performance of the backup when targeting tape devices, some advanced parameters must be defined. The following files must be created. C:\Program Files\Veritas\NetBackup\db\config\NUMBER_DATA_BUFFERS C:\Program Files\Veritas\NetBackup\db\config\SIZE_DATA_BUFFERS C:\Program Files\Veritas\NetBackup \NET_BUFFER_SZ For more information on these advanced NetBackup settings, see the Symantec support documents located at and Table 5. Backup performance with different Config file settings NetBackup setting Default settings NET_BUFFER_SZ Default 512 Enhanced settings NUMBER_DATA_BUFFERS SIZE_DATA_BUFFERS Backup duration (HH:MM:SS) Default 256 Default 262,144 5:07:11 2:42:06 As presented, the role of these configuration files is clear. The performance is significantly improved with the enhanced settings enabled. Impact of the compression The first observation is that the compression is performed by the NetBackup agent and not by the SQL backup/restore API. This is confirmed by the fact that the SQL backup reports a non compressed size (compression ratio is 1). SELECT database_name "Database Name", CONVERT (NUMERIC (20,2), (CONVERT (FLOAT, backup_size) / CONVERT (FLOAT, compressed_backup_size))) "Compression Ratio" FROM msdb.dbo.backupset Table 6. Compression ratio Compression source Database name Compression ratio Compression provided by the NetBackup Agent tpch3000gcp 1 Compression provided by SQL Server 2008 tpch3000gcp 1.94 As shown in Figure 30, the compression ratio obtained with the NetBackup agent is not as efficient that the SQL backup compression feature added with SQL Server

34 Backup duration (HH:MM:SS) Compression ratio Terabytes Figure 30. Backup compression ratio backup size (no compression SQL) backup size (compression NetBackup) backup size (compression SQL) 0 Figure 31 shows the performance impact on backup when NetBackup compression is disabled or enabled. When the backup is performed to tapes, NetBackup compression should be turned off as the compression provided by the tape drives is more efficient. When the backup is performed to disk, NetBackup compression reduces the backup duration. Figure 31. Impact of the compression on backup (tapes and disks) 6:00:00 4:48:00 3:36:00 2:24:00 Compression ON Compression OFF 1:12:00 0:00:00 To Tapes To Disks As expected the CPU use is much higher when NetBackup compression is turned on. Figure 32 shows the average CPU use when performing a backup with compression and without compression to disks. 34

35 Processor time (%) Figure 32. Impact of the compression on CPU use Compression No Compression Back up to tape with NetBackup Performance summary Figure 33 shows in repeated testing that the backup duration improves. The data rate (MB/s) is calculated based on a 3.60-TB database. The best performance (2:00:36) is obtained with the following parameters: Target type: 4 LTO3 tape drives Four stripes NetBackup compression OFF Buffer count 128 Max transfer size: 4 M NetBackup tapes config files Adding more stripes (eight) does not improve the performance. 35

36 Backup duration (HH:MM:SS) Megabytes per second Figure 33. Backup duration improvement during the project (tapes) 7:12: :00:00 4:48:00 3:36:00 2:24:00 1:12:00 6:02:03 4:45:51 3:46:05 5:07:11 2:42:06 2:13:16 2:00:36 1:38:48 0:30: Backup Duration Megabyte per second 0:00:00 0 Run 1 Run 2 Run 3 Run 4 Run 5 Run 6 Run 7 Ref SQL to Tape Ref SQL To NULL Back up to disks with NetBackup performance summary Figure 34 shows how the backup duration improves with repeated testing. The data rate (Megabytes per second) is calculated based on a 3.60 TB database. The best performance (0:40:33) is obtained with the following parameters: Target type: disk volumes (8) 32 stripes NetBackup Compression OFF Buffer count 512 Max transfer size: 4 M NetBackup disk config files 36

37 Backup duration (HH:MM:SS) Megabytes per second Figure 34. Backup duration improvement during the project (disks) 1:40:48 1:26:24 1:12:00 0:57:36 0:43:12 0:28:48 0:14:24 0:00:00 1:33:44 Run 1 1:17:58 1:11:18 1:05:12 Run 2 Run 3 Run 4 0:40:33 Run 5 1:12:45 Run 6 0:56:30 Run 7 0:46:48 0:46:53 Run 8 Ref SQL To disks 0:30:21 Ref SQL to NULL Backup duration Megabytes per second Other consideration Back up to local device During the backup, HP recommends that you verify that there is no traffic over the network. Make sure that you are not backing up over the Ethernet to another media server, which is indicated by very high network use. Assign the NetBackup client to the NetBackup media manager to perform the backup on the local devices (tape drives or disks drives). This can be determined by using Windows Server Resource Monitor. Figure 35. Windows Server Resource Monitor Mounting duration Figure 36 shows the time needed to demount and mount the needed tapes to the tape drives. It takes 200 seconds to complete this task. The target database size is roughly 3.5 TB and one LTO3 tape 37

38 contains 800 GB, which means that eight tapes are required for each backup when using the four drives. Figure 36. Transfer rate while changing tapes Storage unit load balancing policy When the backup is performed to disks storage units, load balancing policies are available to control the way that the NetBackup processes access the different targets. These policies have been evaluated (for the one applicable). As Table 7 lists, the policies do not significantly impact the backup duration. Table 7. Compression ratio Load balancing policy Backup duration (HH:MM:SS) Prioritized 1:17:34 Failover N/A RoundRobin 1:17:20 Media server load balancing N/A Restore by using NetBackup 38 Introduction The restore is initiated from the NetBackup MS SQL Client on the SQL Server. Browse the backup history from the GUI. The target backup version must then be selected. Restore options are available to check the consistency or to define the required recovery state. You can then directly initiate the restore. All the settings can also be stored in a text file.bch for OPERATION RESTORE OBJECTTYPE DATABASE DATABASE "tpch3000gcp" # The following image is type: Full NBIMAGE "DL785G5-1.MSSQL7.DL785G5-1.db.tpch3000gcp.~.7.001of C"

39 SQLHOST "DL785G5-1" NBSERVER "BACKUP" STRIPES 004 BROWSECLIENT "DL785G5-1" MAXTRANSFERSIZE 6 BLOCKSIZE 7 RESTOREOPTION REPLACE RECOVEREDSTATE RECOVERED NUMBUFS 2 ENDOPER TRUE Note When using the GUI to initiate the restore, set the recovery state to Not recovered. To get the restored database online after the restore, set the recovery state to Recovered. Figure 37 shows the GUI when performing a restore. Select the backup image needed for the restore from the backup history. Figure 37. Browsing the backup history When using multiplexing, it might take a while for NetBackup to initiate all the streams needed for a database restore. The default timeout setting 300 seconds was not enough and the restore operations were aborted. It is required to increase the value of the timeout; with 1000 seconds, NetBackup was able to initiate all the streams and to start the restore of the target database. With 32 streams, we measured roughly 11 minutes between the initialization of the first stream and the last stream. As Figure 38 shows, the timeout is defined on the NetBackup client properties. 39

40 Figure 38. Timeout settings Restore from tapes The best performance (2:55:01) for the restore (entire database) is obtained with the following parameters: 4 stripes Block size 64 K Max transfer size 4 M Buffercount 128 Compression OFF The following command is captured with the SQL Profiler when launching the restore with the NetBackup SQL client: Restore database "tpch3000gcp" from VIRTUAL_DEVICE='VNBU ', VIRTUAL_DEVICE='VNBU ', VIRTUAL_DEVICE='VNBU ', VIRTUAL_DEVICE='VNBU ' with stats = 10, blocksize = 65536, maxtransfersize = , buffercount = 128, replace Note Increasing the number of stripes (multiplexing) might increase the performance of the backup, but it significantly impacts the time to restore. 40

41 Figure 39. NetBackup backup and restore duration with tape drives 3:21:36 2:52:48 2:24:00 1:55:12 1:26:24 0:57:36 0:28:48 0:00:00 Backup Restore Duration Restore from disks The best performance (1:28:33) for the restore (entire database) is obtained with the following parameters: 8 targets (MSA Volumes) 32 stripes Block size 64 K Max transfer size 4 M Buffercount 512 Compression OFF Figure 40 shows how the restore duration improves with repeated testing. The data rate (Megabytes per second) is calculated based on a database size of 3,604,556,203,008 bytes (3.6TB). 41

42 Restore duration (HH:MM:SS) Megabytes per second Figure 40. Restore duration improvement during the project (disks) 4:48:00 4:19:12 3:50:24 3:21:36 4:19: :52:48 2:24:00 1:55:12 1:26:24 0:57:36 0:28:48 2:23:57 2:14:57 1:54:21 1:28:331:32:32 1:32:321:33: Restore duration Megabytes per second 0:00:00 Run 1 Run 2 Run 3 Run 4 Run 5 Run 6 Run 7 Run 8 0 Figure 41 shows the disk activities while performing a restore from a non compressed backup. The MSA disk readings are written to the XP disks. Note The average CPU use is 26%. 42

43 Figure 41. Restore read and write activities with no compression Figure 42 shows the disk activities while performing a restore from a compressed backup. There are more write activities than read activities. Note The average CPU use is 85%. 43

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