Champion Solutions Groups Painless Data Migration White Paper


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Whether you want to
upgrade, move, consolidate, and/or replace existing storage, the process of migrating
data off an old storage array onto a new subsystem is an enormous challenge.
Enterprise environments with a heterogeneous mix of application servers, and 24x7
service levels, make scheduling and executing data migration a complex and
convoluted task.
The Champion Solutions Group\'s Data Migration Tool (DMT) and methodology makes
dynamic data migration between unlike OEM storage systems a reality. This solution
allows complete Block-Level data transfers to occur between multiple heterogeneous
OEM storage systems, without host processor intervention (LUN to LUN copy).
Simultaneously (DMT) allows Block-Level application updates to occur dynamically
between existing host based production applications, their associated legacy storage
systems, and the newly introduced target storage system. The complete solution is
simple to introduce and remove from the data transmission network regardless of
whether the network being used is SCSI or Fiber Channel. Our proven synchronous
mirroring capability offers unlimited safe harbor for your data including "Mission
Critical" live databases and the power of open system SCSI and Fiber Channel
standards allow you unlimited "any to anywhere" data migration capability.

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Champion Solutions Groups Painless Data Migration White Paper

  1. 1. Painless Data MigrationA white paper from Champion Solutions Group
  2. 2. Table of ContentsExecutive Summary 1The Data Migration Challenge 2 Downtime 2 Invasive Migration Software 2 Heterogeneous Enterprise Environments 2Data Transfer Options 3 Tape Dump 3 Host-based Software 3 Dedicated Migration Appliance 3Champions Data Migration Tool 4 Champion Data Migration Tool Architecture 5 Live Data Migration 5 No Host Footprint 5 Heterogeneous Migration 6 Reduced Complexity and Risk 6 Proactive Monitoring 6Step-by-step Simplification of Data Transfers 6Conclusion 8Frequently Asked Questions 9
  3. 3. Executive SummaryThe biggest single point of resistance to adopting new technology is the painfulprocess of moving away from an incumbent technology. Whether you want toupgrade, move, consolidate, and/or replace existing storage, the process of migratingdata off an old storage array onto a new subsystem is an enormous challenge.Enterprise environments with a heterogeneous mix of application servers, and 24x7service levels, make scheduling and executing data migration a complex andconvoluted task.The Champion Solutions Groups Data Migration Tool (DMT) and methodology makesdynamic data migration between unlike OEM storage systems a reality. This solutionallows complete Block-Level data transfers to occur between multiple heterogeneousOEM storage systems, without host processor intervention (LUN to LUN copy).Simultaneously (DMT) allows Block-Level application updates to occur dynamicallybetween existing host based production applications, their associated legacy storagesystems, and the newly introduced target storage system. The complete solution issimple to introduce and remove from the data transmission network regardless ofwhether the network being used is SCSI or Fiber Channel. Our proven synchronousmirroring capability offers unlimited safe harbor for your data including "MissionCritical" live databases and the power of open system SCSI and Fiber Channelstandards allow you unlimited "any to anywhere" data migration capability. 1
  4. 4. The Data Migration ChallengeThe complex and labor-intensive task of migrating understandably hesitant when asked todata between storage arrays is a considerable accommodate new software installs on productionheadache for all users of storage equipment. hosts.Whether migrating customers off older, legacydevices, consolidating around a new storage By necessity, migration software runs deep withinarchitecture, or migrating data to new data centers, the operating environment of an applicationthe variables involved in transferring data between server, requiring careful installation and removaldevices are mind-boggling. Enterprise accounts by the professional services team. The intrusiveroutinely contain a diverse array of application nature of the software, its potential to destabilizeservers, operating systems (OSs), file systems, an environment, and its demand for resourcesvolume management methodologies, physical from application hosts, each offer red flags to ITdevice characteristics, and network transport administrators.protocols and topologies. This catalog of variablesequates to months of planning and hours, if not HETEROGENEOUSdays, of manually executed data transfer. ENTERPRISE ENVIRONMENTS Gone are the days when a Companies ITDOWNTIME team could rely on data migration involvingThe “outage window” has virtually vanished from one big server and its associated storage.the vocabulary of enterprise computing Today’s enterprise computing environments containoperations staff. This period of downtime, a complex mix of application servers, OSs,traditionally used by administrators to apply storage devices, and networks.maintenance and changes to production servers,has been shrinking as business applicationsincreasingly adopt 24x7 service levels. Successfully migrating to a new storage platform requires Companies IT teams to maintainCompanies who were once able to leverage the detailed knowledge of all available enterpriseexistence of scheduled outages to migrate data, computing configurations, and the interactionwhen installing and upgrading storage equipment, among all components. The variety of possibleare now placed in an awkward position. Absent a platforms adds tremendous complexity to the dataroutine downtime window, a special outage must transfer process, increasing the elapse time of abe planned, solely for the purpose of installing project and introducing greater storage. This can be a bitter pill forInformation Technology (IT) management toswallow: taking business applications offline iscostly. The unfortunate correlation between newequipment installs and loss of access to revenuegenerating business applications is somethingCompanies try hard to avoid.INVASIVE MIGRATION SOFTWAREMigration software, often used to avoid thedowntime associated with data transfers, presentsanother set of challenges. IT administrators,responsible for the day-to-day availability andperformance of enterprise application servers, are2
  5. 5. Data Transfer OptionsThe demand for a safe data transfer mechanism has both production server stability and applicationbeen around since the first disk drive received an performance. And if no direct network interconnectsupgrade. And, while choices for Companies are to be added, the impact of migration traffic onorganizations have expanded, the process is still local area networks (LAN) must be considered.surprisingly manually intensive and complex. Overcoming IT reticence to installing migration software and hardware on the host requires thatTAPE DUMP Companies perform extensive planning andThe traditional path to migration, a tape dump testing, and gain a thorough understandinginvolves manually taking a point-in-time copy of of company-specific change managementdata, and storing it on a staging medium. After procedures. All of this can add days and weeks to theinstalling new storage equipment, the tape data is project time line of a data migration.restored. Conceptually simple, this process has onesignificant flaw: downtime. Host-based migration solutions promise a no- application-outage data transfer process, but requireIn order to maintain data consistency, application navigation through a minefield of obstacles. Withoutaccess to storage must be stopped throughout the intricate planning and testing, along with accuratedump and restore process. For business applications forecasts of a migration’s effect on servers andthat can accommodate an outage, this procedure is networks, host-based solutions can easily hit snagsstill the simplest and the most straightforward means that sour Companies perceptions and risk damagingof populating a new storage device. However, for I/T credibility.those applications with more demanding servicelevels, a flexible alternative must be sought. DEDICATED MIGRATION APPLIANCE Addressing the shortcomings of host-based methods,HOST-BASED SOFTWARE the dedicated data migration appliance provides aHost-based data transfer tools address some of the standalone, off-host approach to the problem ofinadequacies of traditional tape dump migration by transferring data between storage arrays. Applianceallowing a degree of application access to data during solutions eliminate the need for production serverthe copy process. These solutions require installation disruption during the data transfer process. Asof software on each server accessing data to be application I/Os pass across the network, they aremigrated, and often additional host bus adapters mirrored to new storage devices. This block-level(HBAs) to improve migration performance. The mirroring simplifies the support of heterogeneoussoftware resides on each host server, sitting between storage subsystem migrations by eliminating the needthe file system and device driver. Application I/Os are for involvement in server file systems and OSs.captured before leaving the server, and replicated tothe new storage array. The low-impact nature of the dedicated migration appliance offers a simple solution to the complexitiesHost-based solutions require careful integration with of fallback planning. In the event of a problem, theexisting production system hardware and software, if appliance can be removed from the environment tosmooth operation during the copy process is to be return customers to their original configuration.maintained. Once completed, the items added fordata migration must be thoroughly de-installed to For I/T Departments, the Champions dedicatedreturn customers to the original server and network migration appliance truly represents the holy grail ofconfiguration. data migration. With no host components to deploy, the time consuming, costly, and politically sensitiveThe most significant problem with host-based task of installing and licensing hardware and softwaremigration solutions is that they are host-based. IT on Companies servers can be avoided. Dedicatedadministrators are understandably cautious about the appliances can be rolled into an environment wheneffects of new hardware and software components on needed and rolled out when the migration is over. 3
  6. 6. Champion Data Migration ToolDeveloped for use in demanding 24x7 environments, the Champion Data Migration Toolappliance is a powerful tool for migrating live data between storage arrays. Supportingheterogeneous hosts and storage, the DME eliminates the need for server-based software,significantly reducing the complexity and risk of data migration. Flat Panel Display and Keyboard tray Management Server FC switches Champion DME Modules (8) Ethernet Switch Tool & Cable Box Portable shock mount rack caseFIGURE 1. SAMPLE CHAMPION DATA MIGRATION TOOL RACK CONFIGURATION4
  7. 7. CHAMPIONS DATA MIGRATION TOOL LIVE DATA MIGRATIONThe mobile, rack-mounted appliance, developed Champions Methodology and Tools eliminatesspecifically for data migration, is powered by a the requirement for application downtime duringspecial-purpose operating system. The data migration. Utilizing synchronous mirroringappliance, built with expandable, replaceable, and techniques, data and live updates are copied betweenupgradeable components, is configured to load storage devices without impacting host application I/Obalance across multiple channels, maximizing performance. Once complete, mirror copies aremigration performance and throughput over a FC separated transparently, allowing all application I/Os toconnection. The product is factory configured for flow directly to the new storage device. At no point aremigration, requiring no onsite tuning, and auto- end-users ever aware that data is being migrated.senses host- and device-based LUNs on initial boot.The Tool can be tailored to the specific needs of a Champions Tool supports multiple and simultaneousCompanys professional organization with optional data transfers for increased copy performance andcomponents. reduced migration elapse time. The simultaneous transfer facility can also create duplicate target copies, guaranteeing that high-availability configurations are maintained throughout the cutover to a new storage device.The Champion Data Migration Tool supportssimultaneous, parallel migrations between NO HOST FOOTPRINTheterogeneous storage devices, dramatically reducing The standalone appliance dramatically simplifiesmigration elapse time and increasing performance. Up the data migration process by eliminating the need forto 128 target LUNs are supported by one tool. host-based software. Each Champion appliance is capable of migrating data from many hosts,The Data Migration Tool provides a command line significantly reducing both the overhead of datainterface (CLI), for script-based control, and will be transfers on application servers, and theavailable with a graphical user interface (GUI). Both software licensing costs.the CLI and GUI are initiated through direct IPconnectivity to the management console. No actions No more invasive than an FC switch, Champions Method-on the customer host-server are necessary to -ology end tools requires only dedicated interconnectsconfigure, manage or monitor data migrations. between the appliance, servers and storage to comp-Scripting support allows professional services organizat- -lete data transfers. Champions service teams configure,-ions to develop fully automated data transfer processing. initiate and monitor migration tasks for multiple hosts from a single management interface at the Data Migration Tool.Champions engineers using the Data Migration Toolmigrates data between devices using block-level mirroring.No changes are made to host data and, in the event of aneed to fallback to pre-migration configurations, theDME can simply be removed from the environmentwith no residual impact on either host servers or storage. 5
  8. 8. HETEROGENEOUS MIGRATION STEP-BY-STEP SIMPLIFICATIONPerforming block-level transfers of data, Champion OF DATA TRANSFERSoffers support for heterogeneous host servers and Migration of data using Champions Data Migrationstorage devices. This liberates teams from the Tool is performed independently of host systems. Thecomplexity of cross-vendor migrations, and migration process begins with the introduction of thethe time consuming intricacies of each individual new storage subsystem and DME rack into the OS and file system.REDUCED COMPLEXITY AND RISKMigration of data using Champions engineersand the Data Migration Tool is a straight- HOST SERVERS-forward process. After connecting the appliance tohosts and storage, a direct, block-level copy is madebetween source and target LUNs over the dedicated FCnetwork. Once the copy is complete, mirror pairs aresplit, and LUN maps are transferred between the sourceand target devices. As with any mirroring scenario,updates during the synchronization process are written FC SWITCHto both sides of the mirror, allowing migration to continuewith concurrent live access from business applications.PROACTIVE MONITORINGChampion Data Migration personnel take care of all SOURCE VOLUMESadministration using auto-detection of host anddevice-side volume configurations, and proactivemonitoring of migration progress. Event-basedalerts, configured through the Data MigrationTool management interface, signal data transfer successesand problems to Champions services teams. FIGURE 2. PRE-DATA MIGRATION CONFIGURATION. With no host agents or licenses, the factory configured Champions Data Migration Tool is easily installed and removed.6
  9. 9. HOST SERVERS HOST SERVERS FC SWITCH FC SWITCH DME NEW STORAGE SOURCE TARGET VOLUMES VOLUMESFIGURE 3. CHAMPION DATA FIGURE 4. POST-MIGRATIONMIGRATION TOOL CONFIGURATION. CONFIGURATION.Once the Champion Data Migration Tool and target Creating mirrored LUN copies on the target storage array is astorage are cabled into the stack, automated processes simple, single step procedure. Once initiated, the Datarunning on the Data Migration Tool discovers existing Migration Tool begins synchronizing LUNs and device-side LUN configurations. This information After the synchronization is complete, the mirrored LUNis then used as input to the DME mirroring process. pairs can be split, leaving the LUNs on the target storage device mapped to the application host. The old storage subsystem and Data Migration Tool components can then be removed. 7
  10. 10. ConclusionData migration remains a complex and problematic process, resisting attempts at totalautomation. Just as each enterprise computing environment is unique, each migration task isunique, presenting problems for storage vendor professional services organizations. A solidtoolkit of tried and tested products and procedures that can be tailored to address the needsof any migration project, no matter how complicated, is imperative. The Champion DataMigration Tool is an essential component of the data migration toolkit.Solving the problem of end-user downtime during the data transfer process, ChampionsMigration Tool also offers the heterogeneous support to adapt to any situation that a CorporateI/T team could encounter. Offering safe-harbor guarantees, Champion Solutions Group assurescomplete safety of customer data. Champions Data Migration methodology has no host-footprint,eliminating the need for host licensed software, and can be quickly introduced into a customerenvironment for a migration project and then seamlessly removed once migration is complete.Champion Solutions Group is in a unique position to deliver on the promise of data migrationsolutions. With years of experience delivering storage solutions to major Companies.Champion has the domain expertise, support structures and track record to ensure successin managing business critical data migration.8
  11. 11. Frequently Asked QuestionsQuestion: What modifications will I need to do to my hosts and existing storage systems?Answer: For most data migrations you will not need to make any modifications to your host or existing storagesystems though the host server must meet the minimum firmware and software requirements to support the newstorage.The DMT is designed to be transparent for IO operations between host and source storage. This allows the host toretain the original source storage configuration throughout the data migration operation.When the migration is complete, since the target storage data is identical to the source storage data, the host cansimply be booted up on the target storage.The DMT requires that the host is FC fabric aware. Some older adapters may need to be updated to be fabric awarebefore the migration tool can be placed into the data path.Question How much down time is associated with this migration effort? ::Answe There are two periods of host down time associated with performing an on-line data migration. The host r:must be shut down when the DMT is placed in the data path before the migration can begin and when the DMT isremoved from the data path after the migration is complete. For each target storage channel, two FC cables need tobe moved. Since the DMT can be fully configured before it is placed into the data path, the typical time to physicallyattach the tool and remove the tool is about 15 minutes, much less than the time to bring down the host system andboot the host system back up.Many customers opt to simply perform the migration off-line. Scheduled planned outages often are in the order of 2hours during which host resources cannot be used. During the outage the DMT can easily migrate 200GB of data.Question Do you migrate all of the data? ::Answer Yes, the migration tool copies all the data of each source LUN to the associated target LUN. The DMT will :assure that any new writes from the host during the migration are copied to both source and target LUNs. ::Question What happens to my file system?Answer: Since the DMT performs a block level data copy, it moves everything from the source LUN to the target LUNincluding the file system information. When the host is booted from the target storage, the file system information willbe identical to when it was last shut down on the source storage. 9
  12. 12. Question: What happens if there is an unforeseen interruption of some type while you are in the middle of a datamigration?Answer The DMT always keeps the source storage synchronously updated for all host writes. In the worst case the :DMT can always be removed placing the system back to its original configuration. If a connection is broken betweenthe target storage and DMT, host operation can continue to the source storage, but the migration will need to berestarted once the connection it brought back up.The DMT is designed to take advantage of multi-path redundancy. For multi-path configurations, interruptions to oneof the paths will not affect the migration process.Since the data migration is independent of host processing, a host reboot does not interrupt the data migrationprocess.Question Can you migrate data from older SCSI attached storage systems to newer fiber channel based storage ::solutions?Answer: Yes, data can be migrated on-line from older SCSI storage to FC based storage. The DMT by itself does notsupport the SCSI connection and requires additional Champion product to perform the bridging from FC to SCSI. Themigration tool will provide an exact copy of SCSI data on the FC storage. Once the data has been migrated, thetarget storage can be directly attached to a FC adapter. Contact Champion Solutions Group for additional informationconcerning these opportunities.Question:How about the proprietary IBM SSA direct connected storage?Answer: Yes, data can be migrated from SSA storage to FC based storage. Optional firmware and hardware must bepurchased from Champion to perform the bridging from FC to SSA and to provide the RAID 5 decomposition. The DMTmoves the data from the source storage to the target storage. For SSA installations that use host based RAID 5 dataprotection, during the data movement the migration tool will remove the RAID 5 encoding. Contact Champion SolutionsGroup for additional information concerning this opportunity.Question:What if I want to change the LUN size on the new storage system that I plan on using?Answer: The DMT will make LUN size of the target device the same as the LUN size of the source device.Question:When will I know that the migration is completed?Answer The DMT provides the user with information concerning the percentage of the migration that is completed. :Question: What will I need to do to begin using the data on my new storage system when the migration has beencompleted?Answer: Once the DMT has completed the migration, the host must be shut down and the DMT removed from thedata path. Once the host is booted back up the data can be used. 10
  13. 13. Champion Solutions Group791 Park of Commerce Blvd.Boca Raton, FL 33487-3632Main: 561 997-2900Toll Free: 800 771-7000www.championsg.comAll rights reserved. Other trademarks and service marks appearingherein are property of their respective owners. Specs subject tochange without notice.