EMC CLARiiON MirrorView/Synchronous with Sybase Mirror Activator

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1 EMC CLARiiON MirrorView/Synchronous with Sybase Mirror Activator Applied Technology Abstract This white paper is a technical reference for using Sybase Mirror Activator (MA) and EMC CLARiiON MirrorView /Synchronous replication technology in a Sun Solaris environment. February 2009

2 Copyright 2009 EMC Corporation. All rights reserved. EMC believes the information in this publication is accurate as of its publication date. The information is subject to change without notice. THE INFORMATION IN THIS PUBLICATION IS PROVIDED AS IS. EMC CORPORATION MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WITH RESPECT TO THE INFORMATION IN THIS PUBLICATION, AND SPECIFICALLY DISCLAIMS IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Use, copying, and distribution of any EMC software described in this publication requires an applicable software license. For the most up-to-date listing of EMC product names, see EMC Corporation Trademarks on EMC.com All other trademarks used herein are the property of their respective owners. Part Number h6067 Applied Technology 2

3 Table of Contents Executive summary...4 Introduction...4 Audience... 4 Replication technologies...4 EMC MirrorView/S...5 Sybase Mirror Activator...6 How Mirror Activator works with MirrorView/S...6 Minimum requirements for Mirror Activator with MirrorView/S...8 Test environment configuration...8 Source and target host configuration... 8 CLARiiON CX3 configuration... 8 Planning for Mirror Activator with MirrorView/S...9 Configure EMC MirrorView/S... 9 Execute CLARiiON MirrorView/S Enabler for Sybase Mirror Activator Configure the Sybase ASE environment Materialize the Sybase ASE database Test scenarios...11 Certify standby materialization Basic replication Disaster simulation Primary server fails MirrorView link fails Log device extension Failover/Failback Failover Failback Conclusion...17 References...17 Applied Technology 3

4 Executive summary EMC CLARiiON MirrorView /Synchronous (MirrorView/S) provides a mirrored storage system-based replication solution to remotely maintain up to two real-time copies of a logical unit (LUN) at separate locations. Sybase Mirror Activator, a business continuity tool that harnesses storage-based (block level) replication products like MirrorView/S, dramatically lowers overall total cost of ownership (TCO) by cutting failover time, providing zero data loss, reducing network bandwidth requirements, and making the usually idle standby database available for reporting and decision support. The solution described in this white paper combines the two technologies to provide both guaranteed data delivery and a high return on investment (ROI) by providing continued access to standby resources. EMC MirrorView/S remote replication technology is used to create initial copies of the database and to create a mirror copy of the database transaction log. Sybase technology is then used to read the log mirror and update the available standby systems without impeding their availability. Introduction This white paper provides examples for using the combined technologies in disaster recovery situations. It does not serve as an installation guide. Testing was conducted to prove that the target system maintained data consistency and integrity. The goal was to ensure that Sybase Adaptive Server Enterprise (ASE) is restartable, consistent, and error-free at the conclusion of each test. Examples shown are for the Sun Solaris platform. Audience This white paper is intended for system administrators and database administrators responsible for deploying Sybase Mirror Activator on EMC CLARiiON storage arrays. The reader should be familiar with Sybase ASE, Sybase Mirror Activator, and CLARiiON storage systems. Replication technologies A discussion on storage-based replication versus transactional replication is warranted. Disk (or storage)- based replication systems, such as EMC MirrorView/S, replicate the contents of physical devices from a primary storage unit (source site) to a secondary storage unit (target site). There are pros and cons associated with implementing a solution that is solely based on one or the other replication technologies. The advantages and disadvantages are discussed in this section. Primary benefits of storage-based replication are: Zero data loss solution with synchronous replication Redundancy and protection of primary devices at a secondary site Allows near-instantaneous disk recovery operations Does not require any host on the target side Main disadvantages associated with storage-based replication technologies are: Physical disk corruptions at the primary site may be propagated to the standby site. With synchronous storage-based replication, the data at the target site is not available to any application until a failover occurs. Transaction replication systems, such as Sybase Mirror Activator, read the transaction log of the primary database, convert the log records into equivalent SQL commands, and then apply the SQL to a running Applied Technology 4

5 database. Transaction replication is logical replication. It is based on the transaction log of the primary database, so it follows all of the data integrity rules of the database. Primary benefits of transaction replication are: Standby databases are online and available for failover as well as decision support. Data integrity (or transactional consistency) between primary and standby databases is guaranteed. The main disadvantage associated with transaction replication is the following: Transaction replication is asynchronous, thereby allowing for the possibility of data loss. If the primary site experiences an unplanned outage after a transaction is committed, but before the replication system reads the primary log record, the transaction will not be replicated to the standby site. The EMC MirrorView/S with Mirror Activator solution takes advantage of the strengths of both storagebased and transactional replication to provide both guaranteed data delivery and continued access to standby resources. EMC MirrorView/S MirrorView/S maintains a real-time, synchronous replica of production or primary (source) site data to a standby or secondary (target) remote site. In the event that the server and/or storage array at the primary site fails, the secondary set of images at the remote site can be quickly promoted to take over the role of primary, thus allowing continued access to the production data. MirrorView/S operates in a highly available environment, leveraging the dual storage processor (SP) design of CLARiiON systems. If one SP fails, MirrorView/S running on the other SP will control and maintain the mirrored LUNs. Because MirrorView/S is storage-based software, no server I/O or CPU resources are required to replicate the data. MirrorView/S is transparent to servers and their applications. A synchronous mirrored pair consists of a source LUN on the primary storage configured to pair up with a corresponding LUN on the secondary storage. While in a mirroring relationship, the secondary image is not accessible to any servers. In this case, MirrorView/S can be used with other EMC CLARiiON replication software such as SnapView to create a local snapshot or clone of the secondary image. The local snapshot or clone can then be made available for server access. MirrorView/S supports consistency groups. A consistency group is a set of synchronously mirrored pair LUNs whose secondary images need to be kept consistent with each other in order to be meaningful. The set of mirrors in a consistency group function together as a unit such that if replication fails for one member in the set, replication for all other members of the set is cancelled or stopped as well. Using this technology, MirrorView/S maintains write ordering across the secondary images in the event of a service interruption to any of the write-order dependent LUNs. This guarantees that the contents of all replicated LUNs in the consistency group set are identical point-in-time replicas of their source and that write-ordered dependency is maintained. The main consideration with synchronous mirroring is that each server write is affected by the time it takes to replicate the data to the remote storage system. The greater the distance is between the production site and the remote secondary site, the greater the propagation latency. Therefore, the distance of the replication may be limited by the application s tolerance for latency. In addition, the link between the primary and remote systems must be able to handle peak workload bandwidths, which can add cost to the link. For additional product support documentation on EMC CLARiiON MirrorView/S, see the appropriate documents in the References section at the end of this document. Applied Technology 5

6 Sybase Mirror Activator Sybase Mirror Activator is a Sybase software solution that allows users to combine the benefits of transaction replication and storage-based replication, thus eliminating the disadvantages of using either system alone in a disaster recovery situation. 1 The Mirror Activator solution combines Sybase Mirror Replication Agent, Sybase Replication Server, and EMC CLARiiON MirrorView/S. This solution applies to both the CLARiiON CX3 and CX4 platforms running MirrorView/S. Sybase Mirror Activator reads a primary database transaction log device in order to replicate transactions. It is specifically designed to remotely mirror log devices that reside on a separate host from the primary data server. Mirror Activator acquires transactions from the primary database transaction log and sends them to the Replication Server. The Replication Server then distributes the transactions to the standby database. Mirror Activator requires only read access to the mirror log device, and takes advantage of the strengths of both disk mirroring and transactional replication. It is designed specifically to be configured with a storage-based replication technology like MirrorView/S. EMC MirrorView/S and Sybase Mirror Activator together provide a zero-data-loss solution that significantly reduces RTO and improves return on investments from continued access to standby resources. For additional product support documentation on Sybase Mirror Activator installation and configuration, refer to the Mirror Activator Document Sets page on the Sybase website: =0&Submit.x=34&Submit.y=16 How Mirror Activator works with MirrorView/S By combining a storage block level replication product such as MirrorView/S with Sybase Mirror Activator, together they provide a zero-data loss solution for mission-critical applications. The target systems and applications are up and running at all times, eliminating the need for database (or application) restart. Customers can leverage their investment in hardware and software at the target because these systems are no longer sitting idle, awaiting a failover in the event of an unplanned outage or a disaster. 1 Sybase Mirror Activator Administration Guide Applied Technology 6

7 Figure 1. EMC CLARiiON MirrorView/S with Sybase Mirror Activator environment Figure 1 is a high-level overview of a disaster recovery (DR) solution using Sybase Mirror Activator with MirrorView/S. Data is entered into the primary site via transact-sql, a user application, or other front-end interface. Transactions are replicated synchronously from the primary CLARiiON to the target CLARiiON via MirrorView/S. Sybase Mirror Activator reads the log file at the target site, which has been synchronously replicated, and sends all transactions to the Sybase Replication Server. The Sybase Replication Server updates the target database by transforming the incoming data from Mirror Activator into SQL. Mirror Activator with MirrorView/S advantages Compared to disaster recovery solutions that are stand-alone disk replication or transaction replication, the advantages of Mirror Activator are as follows: Lower TCO Reduced network bandwidth requirements, because only the primary log devices need to be mirrored (primary data devices need not be mirrored) Hardware-independence for the standby DBMS (both hardware and operating system flexibility) Enhanced ROI No downtime required for standby databases (standby is online and available for client applications, standby is up to date) No idle time required for the standby hardware and infrastructure (standby is available when not used for recovery) An integrated disaster recovery solution, combining storage and transaction level replication Standby databases are protected from logical disk corruption Synchronous replication, with zero data loss and guaranteed data integrity (transactional consistency) Complete coverage for all data resources: databases, file systems, LVMs, and others Applied Technology 7

8 Minimum requirements for Mirror Activator with MirrorView/S Table 1 describes the minimum software and release levels required in order to implement the Sybase Mirror Activator with CLARiiON MirrorView/S solution. Table 1. Minimum requirements Company Product Version Sybase Adaptive Server Enterprise Sybase Mirror Activator 15.0 EMC Primary and target CLARiiON CX3 FLARE release 26 EMC Naviscli 6.26 EMC PowerPath EMC CLARiiON MirrorView/Mirror Activator Enabler n/a Test environment configuration This section describes the configuration of the environment used to qualify Sybase Mirror Activator functionality with EMC CLARiiON MirrorView/S. Source and target host configuration Primary host and target host Sun Solaris (SPARC) 10 EMC PowerPath Version Navisphere Command Line Interface (CLI) Version Sybase ASE CLARiiON CX3 configuration Source CLARiiON Target CLARiiON CLARiiON CX3-20c CLARiiON CX3-20c FLARE version FLARE version MirrorView Enabler MirrorView Enabler SnapView Enabler SnapView Enabler Applied Technology 8

9 Device configuration Sybase device Primary host Primary LUN ID Host device Secondary host Target LUN ID Host device Target Clone ID Host device master 1 power20g 1 21 power11g sybprocs 3 power23g 3 23 power9g sybsysdb 2 power26g 2 22 power10g datadev1 7 power28g 7 27 power6g datadev2 5 power22g 5 25 power8g logdev1 6 power24g 6 mralog power19g 26 power7g newlogdev2 8 Power31g 8 newlogdev2 power21g 28 Power22g Planning for Mirror Activator with MirrorView/S Configure EMC MirrorView/S Execute the CLARiiON MirrorView/S Enabler for Sybase Mirror Activator Configure a Sybase ASE environment Materialize the Sybase ASE database Configure EMC MirrorView/S For MirrorView/S, consistency groups are crucial to performing consistent fracture operations for databases that span multiple LUNs. With consistency groups, if one member of the group fractures, then all of the members of the group fracture as well, thus preserving data integrity across the set of secondary images. This allows I/O to continue to the primary LUNs but not to the secondary LUNs. Assuming that MirrorView connections between storage systems have been established and the required LUNs have been created on both the primary and secondary storage arrays, the next step is to pair a primary LUN with the appropriate secondary LUN to create a remote synchronous mirror. Once all the necessary remote mirrors have been setup, create a Consistency Group that has as its members all the remote mirrors that have content related and dependent write-order data that must be replicated as a set in order to be usable. While in a mirroring relationship, the secondary image is not accessible to any servers. One way to enable server access while maintaining ongoing mirror synchronization is to create a local clone of the secondary image using EMC SnapView clone technology. Clones are exact full binary copies of their source and when fractured can be accessed by a secondary server. For added protection, the protected restore feature of clones protects data on a clone during a reverse synchronization such that any server writes made to the source LUN during a reverse synchronization will not be copied to the clone. Additionally, with this feature, the software automatically fractures the clone after the reverse synchronization has completed. For this integrated solution, materialization of the Sybase ASE database at the standby site uses clones of the secondary images (both data and log devices). Once materialization is complete, Mirror Activator needs direct access to the secondary image of only the log devices for ongoing replication. To enable server access to the secondary log devices while maintaining continuous synchronization with its primary source, these secondary log devices will need to be activated for Mirror Activator access using the CLARiiON MirrorView/S Enabler for Sybase Mirror Activator that is downloadable from EMC Powerlink. The next section details the process to acquire and run the executable. Applied Technology 9

10 For in-depth information on MirrorView/S and SnapView architecture and basic operations, see the appropriate documents in the References section at the end of this paper. Execute CLARiiON MirrorView/S Enabler for Sybase Mirror Activator Sybase Mirror Activator on the secondary server requires access to the remote mirrored log device in order to apply ongoing changed data to the standby database. The CLARiiON MirrorView/S enabler facilitates this process. This enabler is intended only for Sybase customers deploying the Mirror Activator product using MirrorView/S on a Solaris (SPARC) 10 platform. Usage of the enabler requires that the CLARiiON Navisphere Secure Command Line Interface (naviseccli) be installed on the Solaris server and that the required Navisphere user account be created on the CLARiiON storage systems. Details for setting up the required Navisphere account can be found in the Navisphere documents listed in the References section at the end of this paper. The enabler is available for download from EMC Powerlink: Home > Solutions > Solutions by Application/Vendor > Sybase > Tools After downloading the enabler (CLARiiON_enabler.tar.gz) from Powerlink to the server, extract the contents using the following commands: gunzip CLARiiON_enabler.tar.gz tar -xvf CLARiiON_enabler.tar A default folder (CLARiiON_enabler) will be populated with the following files: MActMView* README README.doc (binary executable) (README in text format detailing MActMView usage) (README in WORD format detailing MActMView usage) Three functions are available using the executable MActMView : status, activate, deactivate. Syntax of the command is as follows: MActMView <status activate deactivate> sp-name mirrorname [username passwd scope] WHERE: status activate deactivate Displays status (activated/deactivated) for the specified mirror Activate specified mirror for Mirror Activator Deactivate specified mirror from Mirror Activator sp-name mirrorname username passwd scope IP address or network name of the targeted SP Name of the mirror on the target storage system Username of the account on the target storage system Password of the user on the target storage system Scope (0 1 2) of the user account on the target storage system NOTE: username passwd scope are optional parameters if a Navisphere security file has been established on the server. The MActMView status command displays the status of the specified mirror. Example: MActMView status ss1_spa logdev1 username mypasswd 0 The MActMView activate command activates the specified mirror for Mirror Activator. Example: MActMView activate ss1_spa logdev1 username mypasswd 0 The MActMView deactivate command deactivates the specified mirror from Mirror Activator. Example: MActMView deactivate ss1_spa logdev1 username mypasswd 0 Applied Technology 10

11 Configure the Sybase ASE environment Configuring the Sybase environment involves the following steps: Create the primary database (if it does not already exist) Create the target (standby) database Populate the standby database with data (via materialization) Install and configure the Replication Server and Mirror Activator For best results with configuring the Sybase environment, refer to the Sybase Mirror Activator 15.0 Quick Start Guide, which can be found at: Materialize the Sybase ASE database The view of the environment during materialization starts with the primary database. The primary database has two types of devices: a data device where the database stores the contents of the database, and a log device where the database keeps a record of the changes that occur. The data and log devices are physically stored in an EMC CLARiiON storage array. A replica (or cloned copy) of the primary database exists at the standby site once the materialization process is complete. Just like the primary database, the standby has a data device and a log device. The standby devices are also stored on a CLARiiON storage array, located at a remote site. Materialization is accomplished by bringing the primary and standby database devices into a paired relationship with one another using MirrorView/S. An exact copy of the primary database is made by synchronizing (establishing) the database device pairings. Once these pairings have been fully synchronized, an exact duplicate copy of the primary database exists at the target. The relationship between the primary and target devices can then be severed (or split), and the target database is brought online. Test scenarios The following tests were performed to qualify Sybase Mirror Activator functionality with EMC MirrorView/S. All tests use the consistency group feature of MirrorView/S and the protected restore feature of clones. These tests assume that Sybase Mirror Activator has been installed and configured on the secondary site. For installation and configuration information, refer to the Sybase Mirror Activator 15.0 Quick Start Guide and Sybase Mirror Activator 15.0 Administration Guide available on: Certify standby materialization Basic replication Disaster simulation! Primary server fails! MirrorView link fails! Log device extension! Failover and failback The test scenarios use the following naming conventions to refer to the various entities on the primary or secondary sites: At the primary site: A1 = Primary ASE DBMS C1 = Primary CLARiiON storage array Applied Technology 11

12 C1:PD1 = Primary ASE data devices on primary CLARiiON storage C1:PL1 = Primary ASE log devices on primary CLARiiON storage C1:EPL2 = New primary ASE log device added on primary CLARiiON storage At the secondary site: A2 = Target ASE DBMS C2 = Target CLARiiON storage array C2:TD1 = Target ASE data devices on target CLARiiON storage C2:TL1 = Target ASE log devices on target CLARiiON storage C2:CTD1 = Clone of Target ASE data devices on target CLARiiON storage C2:CTL1 = Clone of Target ASE log device on target CLARiiON storage C2:ETL2 = New target ASE log device added on target CLARiiON storage Figure 2. Overview of the device environment Certify standby materialization Once the replication system (ASE and Mirror Activator) is configured and initialized, the standby database must be materialized. Materialization of the database at the secondary or standby site uses clones (C2:CTD1/C2:CTL1) of the secondary image LUNs. The goal of this test is to verify the materialization procedure. The following steps outline the procedures necessary to complete this test: 1. Configure C1 and C2 devices as synchronous mirrored pairs for MirrorView/S remote mirroring: C1:PD1 mirrored to C2:TD1 C1:PL1 mirrored to C2:TL1 2. Create a synchronous consistency group that has as its members all the log and data remote mirrored pairs. 3. Create clones for C2 target data and log devices: C2:TD1 source of clone C2:CTD1 C2:TL1 source of clone C2:CTL1 Applied Technology 12

13 4. Enable primary server access to C1 primary devices by adding the C1 primary devices to the storage group of the primary server: C1:PD1 to storage group of A1 primary server C1:PL1 to storage group of A1 primary server 5. Add the C2 clone devices to the storage group of the secondary server. These C2 clone devices will then be accessible by the secondary server once it is fractured: C2:CTD1 to storage group of A2 secondary server C2:CTL1 to storage group of A2 secondary server 6. Install and configure A1 primary ASE DBMS and bring online. 7. Quiesce the A1 primary database that resides on the C1 primary data and log devices. 8. Ensure C2 mirrored data and log (C2:TD1/C2:TL1) devices are in a Synchronized state. 9. Fracture the C2 mirrored data and log devices: C2:TD1 fractured from C1:PD1 C2:TL1 fractured from C1:PL1 10. Ensure C2 clone data and log (C2:CTD1/C2:CTL1) devices are in a Consistent or Synchronized state. 11. Consistent clone fracture the C2 clone data and log devices, making them accessible to the A2 secondary server: C2:CTD1 fractured from C2:TD1 C2:CTL1 fractured from C2:TL1 12. Bring the A2 standby database that resides on the C2 clone data and log devices online. The A2 database is on the clone of the mirrored secondary devices, not on the mirrored devices themselves. 13. Verify that A2 is a restartable and consistent database image. Creating a restartable database image and consistent instance of Sybase at the target means ensuring that MirrorView/S can provide a database image at the target. This completes its normal restart procedures and each database is brought online successfully. Basic replication The goal of this test is to verify that EMC MirrorView/S and Sybase Mirror Activator provide an active standby replication solution. This test uses MirrorView/S to continuously replicate the A1 database log device (C1:PL1) to its remote image (C2:TL1) on the secondary storage array. Sybase Mirror Activator then reads C2:TL1 and distributes the changes to the A2 database. The following steps outline the procedures necessary to complete this test: 1. Complete steps 1 thru 6 as outlined in the test scenario Certify standby materialization. 2. Materialize the A2 standby database and bring online as documented in the Sybase Mirror Activator 15.0 Administration Guide available on 3. Add the mirrored C2 log device to the storage group of the A2 secondary server: C2: TL1 to storage group of A2 secondary server 4. Synchronize replication between the C1 primary log device and its mirrored C2 secondary log device: Applied Technology 13

14 C2:TL1 synchronize with C1:PL1 5. Activate the C2 log device using the CLARiiON MirrorView/S Enabler. This enables Mirror Activator to directly access the mirrored C2 log device image (C2:TL1) on the secondary site. The section Execute CLARiiON MirrorView/S Enabler for Sybase Mirror Activator on page 10 provides additional details. 6. Resume replication for Mirror Activator. 7. Transactions were generated such that change data flows from the C1 primary log device to the C2 secondary log device: C1:PL1 data changes mirrored to C2:TL1 8. Verify that the transactions coming across MirrorView/S are being pulled directly from device C2:TL1 by Mirror Activator and distributed to the A2 standby database by Replication Server. 9. Verify that the A2 standby database received all transactions. Disaster simulation Two different scenarios, loss of primary production site and failure of a MirrorView link, were simulated to test for disaster and recovery. Primary server fails The goal of this test is to verify that EMC MirrorView/S and Sybase Mirror Activator provide a no-dataloss replication solution in the event that the primary site goes down due to a disaster. To simulate a disaster, the ASE process on the primary server was killed while transactions were flowing from the C1 primary log device to its mirrored C2 secondary log device. The following steps outline the procedures necessary to complete this test: 1. Complete all steps as outlined in the test scenario Basic replication. 2. Crash the primary A1 database (kill -9 on A1 process id) while change data is flowing from the C1 primary log device to its mirrored C2 secondary log device. 3. Suspend Mirror Activator after all transaction replication has quiesced. 4. Bring the A1 database back online and resume Sybase Mirror Activator. 5. Verify that the A2 standby database is consistent with the A1 primary database. MirrorView link fails The goal of this test is to verify recovery after a hardware failure such as when the MirrorView/S link fails. In this test, the MirrorView link between the primary C1 CLARiiON storage array and the target C2 CLARiiON storage array was disconnected while transactions were flowing between the two CLARiiON storage arrays. The following steps outline the procedures necessary to complete this test: 1. Complete all steps as outlined in the test scenario Basic replication. 2. Disconnect the mirroring cable between the C1 and C2 CLARiiON storage arrays while change data is flowing from the C1 to the C2 CLARiiON storage array. Disconnecting the mirroring cable automatically fractures all the mirrored devices. While the secondary mirrored image is fractured, the Applied Technology 14

15 primary storage array minimizes the amount of work required to synchronize the secondary after it recovers by keeping track of write requests to the mirror. 3. Suspend Sybase Mirror Activator. 4. Re-establish the mirroring cable between the C1 and C2 CLARiiON storage arrays. 5. If the recovery policy (policy for recovering the secondary image after a system fracture) is set to automatic, MirrorView/S will automatically synchronize the secondary image when the connection is restored; otherwise, the administrator must explicitly start the synchronization. 6. Resume Mirror Activator. 7. Verify that the transactions coming across MirrorView/S are being pulled directly from device C2:TL1 by Mirror Activator and distributed to the A2 standby database by Sybase Replication Server. 8. Verify that the A2 standby database is consistent with the A1 primary database. Log device extension The goal of this test is to verify that Mirror Activator functions properly when a log device is added to the A1 primary database. The following steps outline the procedures necessary to complete this test: 1. Complete all steps as outlined in the test scenario Basic replication. 2. Configure a new C1 and C2 log device as a synchronous mirrored pair for MirrorView/S remote mirroring: C1:EPL2 mirrored to C2:ETL2 3. Add the new mirrored pair to the consistency group. 4. Enable primary server access to the new C1 primary log device by adding it to the storage group of the primary server: C1:EPL2 to storage group of A1 primary server 5. Add the new mirrored C2 log device to the storage group of the secondary server: C2: ETL2 to storage group of A2 secondary server 6. Activate the new C2 mirrored log device using the CLARiiON MirrorView/S Enabler. This enables Mirror Activator to directly access the C2 mirrored log device image (C2:ETL2) on the secondary site. The section Execute CLARiiON MirrorView/S Enabler for Sybase Mirror Activator on page 10 provides additional details. 7. Ensure the new C2 mirrored log device (C2:ETL2) is in a Consistent or Synchronized state. 8. Fracture the new C2 mirrored log device: C2:ETL2 fractured from C1:EPL2 9. Suspend Mirror Activator after all transaction replication has quiesced. 10. Add the new C1 log device (C1:EPL2) to the A1 primary database and the new C2 mirrored log device (C2:ETL2) to the A2 standby database using the disk init and alter database commands. 11. Update the Mirror Activator s device repository using the ra_updatedevices command. Applied Technology 15

16 12. Set the path to the new C2 mirrored log device using the ra_devicepath command. 13. Synchronize replication between the new C1 primary log device and its C2 mirrored log device: C2:ETL2 synchronize with C1:EPL2 14. Resume Mirror Activator. 15. Verify that the transactions coming across MirrorView/S are being pulled directly from device C2:ETL2 by Mirror Activator and distributed to the A2 standby database by Sybase Replication Server. 16. Verify that the A2 standby database is receiving all transactions and that the database is consistent with the A1 primary database. Failover/Failback The goal of this test is to verify the procedure for a failover/failback scenario. The following steps outline the procedures necessary to complete this test: NOTE: The steps outlined for failover/failback are associated with storage replication only. These procedures do not depict failover for the database user or application. Failover 1. Complete all steps as outlined in the test scenario Basic replication. 2. Crash the primary A1 database (kill -9 on A1 process id) while change data is flowing from the C1 primary log device to its mirrored C2 secondary log device. 3. Suspend Mirror Activator after all transaction replication has synchronized. The A2 standby database continues to use the clones of the secondary data and log devices. Transactions were generated against the standby database that is on the clone of the mirrored secondary devices. Failback 1. Shut down the A2 standby database. 2. Ensure the secondary consistency group is in a Consistent or Synchronized state. 3. Promote the secondary consistency group. When a secondary image is promoted, the former primary image is demoted to a secondary image: C2:TD1 and C2:TL1 promoted to primary image C1:PD1 and C1:PL1 demoted to secondary image 4. Fracture the mirror consistency group. 5. Reverse-synchronize the clones of the original secondary images. This replaces the data on the A2 mirror images with data from its clone: C2:CTD1 reverse synch to C2:TD1 C2:CTL1 reverse synch to C2:TL1 Applied Technology 16

17 6. Synchronize the fractured mirror consistency group. This replaces the data on the A1 primary database with data from its A2 mirrored images: C1:PD1 synchronize with C2:TD1 C1:PL1 synchronize with C2:TL1 7. Promote the original primary mirror: C1:PD1 and C1:PL1 promoted to primary image C2:TD1 and C2:TL1 demoted to secondary image Conclusion The solution described by this paper combines the two technologies to provide both guaranteed data delivery while providing improved ROI from continued access to standby resources. The remote replication technologies of EMC are used to create initial copies of the database and to create a mirror copy of the database transaction log. Sybase technology is then used to read the log mirror and update the available standby systems without impeding their availability. While the procedures used to bring these technologies together in these testing examples serve to show the validity of the solution, the environment is by no means limited to the one that is described here. Rather, these procedures and examples can act as a starting point for tailoring a solution with Sybase Mirror Activator and EMC CLARiiON MirrorView/S that meets your requirements for disaster recovery. References Sybase Mirror Activator documentation can be found on the Mirror Activator Document Sets page on Sybase.com. Titles include Sybase Mirror Activator 15.0 Quick Start Guide, Sybase Mirror Activator 15.0 Administration Guide and Sybase Mirror Activator 15.0 Configuration Guide: =0&Submit.x=34&Submit.y=16 More information on EMC MirrorView and SnapView, including product overviews and data sheets, can be found on EMC.com: MirrorView page: SnapView page: EMC product documentation can be found EMC Powerlink, EMC s customer- and partner-only website. Titles include: EMC Navisphere Manager Help EMC Navisphere Command Line Interface (CLI) Reference EMC MirrorView/Synchronous Command Line Interface (CLI) Reference EMC SnapView Command Line Interfaces (CLI) Reference The Sybase partner solution page on Powerlink can also provide more information: Home > Solutions > Solutions by Application/Vendor > Sybase Applied Technology 17

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