COMPAREX - Symmetrix Remote Data Facility (SRDF)



	Symmetrix Remote Data Facility (SRDF) Information protection and business continuance in the event of planned or unplanned outages The only solution for mainframe, UNIX, Windows NT and AS/400 systems Host independence online, realtime data mirroring for one or more local or remote copies Business data available in minutes for simple and fast recovery Relieves disruptions from scheduled outages and the "race to sunrise" Highest extended distance performance and communication line efficiencies achieved through multi-hop capability and SRDF FarPoint GDPS compatibility provides transparent integration of SRDF into a GDPS environment Superior Data Availability for Continuous Enterprise Operations EMC Enterprise Storage helps you realize your most aggressive business goals through intelligent information sharing, management, and protection. Achieving those goals is what we call experiencing The EMC Effect. Symmetrix Remote Data Facility (SRDF) helps you achieve The EMC Effect by providing you with complete business continuance capability in the event of a data center disaster, and during planned events such as daily backups, database loads and refreshes, application testing, scheduled maintenance, and data center migrations or consolidations. SRDF is the only solution providing this facility simultaneously to mainframe, UNIX, Windows NT and AS/400 systems. This online, host-independent, mirrored data storage solution duplicates your production site data on one or more physically separate target Symmetrix 3000 or 5000 systems. Systems can be across the room, across the globe, or anywhere inbetween. Wherever their location, SRDF business continuance enables you to realize 24´7 revenue generation and customer service capabilities for increased competitive advantage. SRDF manages the expected and the unexpected. Disaster Recovery The typical recovery routine involves customized software and complex procedures. Offsite media usually using comparatively slow tape technology must be either electronically transmitted or physically shipped to the recovery site. This is followed by time-consuming restores and the application of logs. With SRDF, business operations are resumed much faster than with any alternative storage solution. Simply stated, SRDF allows users to restart rather than recover their operational systems. Eliminating the "Race to Sunrise" Standard practice is to conduct regularly scheduled backups. With today s global enterprises, this practice has become anything but routine. Applications are larger, backup windows are smaller, and any downtime at all costs revenue or service loss. SRDF eliminates the race to sunrise while allowing your business operations to run continuously. Scheduled backup operations, data warehouse loading, or new application testing is performed from the target Symmetrix data while normal operations are continuously running on the source Symmetrix. All the while, your data can be safely protected, available, and expanding its earning power. For many businesses, the SRDF payback is measured in just days. SRDF is the Premier Business Continuance Solution for Enterprise Computing Environments Data Migration Because SRDF enables you to migrate data between sites quickly and nondisruptively, it can be used to support consolidation of data centers and reallocation of site workloads. It alleviates the usual lengthy outages and the need to transport physical media. IS staff can manage data migration in real time using Symmetrix Manager software while applications remain online. Scheduled Maintenance SRDF also enables business operations to continue during scheduled site maintenance, such as operating system upgrades, host processor upgrades, and environmental disruptions. After applications are switched to the remote site, normal operations continue using the remote copy of synchronized application data. Disaster Recovery Testing You can test disaster recovery plans without manually intensive recovery drills, complex procedures, and business interruptions. IS staff can simply switch to the remote site at any time testing can be performed during normal business operations. For businesses serving global markets, ensuring the highest level of data availability with no downtime is especially critical. Seamless SRDF Integration into IBM GDPS Environments EMC Consistency Groups for MVS (Con-Group-MVS) helps organizations keep their business running cost effectively, at full capacity. This EMC software utility runs on IBM hosts and maintains a coherent database (consistent state) spread across multiple Symmetrix units in an SRDF configuration. The key feature of EMC Consistency Groups for MVS is GDPS (Geographically Dispersed Parallel Sysplex) support, which provides transparent integration of SRDF into an IBM GDPS environment. Utilizing MVS functions, EMC Consistency Groups for MVS captures all PPRC commands directed to SRDF devices and converts them into SRDF-equivalent functions, enabling EMC s GDPS compatibility. SRDF, in conjunction with Consistency Groups, protects the enterprise by guaranteeing the consistency of its data even in the event of a failure or lost link, as in, for example, a cable cut. It is through Consistency Groups that non-GDPS IBM Parallel Sysplex clusters can be supported. These systems need mechanisms to stop I/Os from being sent to storage during an error condition. SRDF Solutions to Meet Your Specific Needs SRDF is a high-performance solution. It provides full mirroring of data between source and target systems. A single SRDF-con gured Symmetrix can serve as the backup for up to 16 local or remote Symmetrix systems. At both the source and target sites, either Mirroring (RAID 1), RAID-S, or an intermix of both can be enabled within Symmetrix systems. Quick and Easy Recovery from Unplanned Outages SRDF copies all user-specified data from a source Symmetrix system to a target Symmetrix. IS staff can quickly switch over from source to target when data center operations are disrupted. When the disruption at the primary site has been rectied, the communication link can be re-established. SRDF will automatically resynchronize the data between the sites, and normal operations can resume. SRDF Connectivity Supports Varying Geographic Requirements EMC offers several SRDF connectivity implementations to meet the specific geographic requirements of your business continuance solution. The ESCON-based campus solution provides mirroring operations for target Symmetrix systems located from 10 feet to 66 kilometers from your source data center. For contingency sites farther removed geographically, SRDF FarPoint" software supports mirroring across all SRDF-supported telecommunications links, including T1/E1, T3/E3 and ATM. SRDF FarPoint significantly increases performance through optimization of the communication line resulting in a much more cost-effective solution and, in some instances, allowing the same level of performance with fewer lines. Multi-Hop Capability Makes Long-Distance Mirroring More Affordable Another time- and cost-saving feature of SRDF is its multi-hop capability. Multi-hop enables SRDF users to mirror only data that has changed since the last update onto a Symmetrix system in a third location. Utilizing EMC TimeFinder, this feature is ideal for cost-effectively mirroring data long-distance. By copying only the changed tracks, less bandwidth is consumed, performance is enhanced, and transmission times are shorter. Multi-hop mirroring to the third site can take place during off-peak times over lower cost transmission lines. Recurrent monthly line costs can be dramatically reduced, quickly recouping the investment in a third Symmetrix system. SRDF Supports Multiple Modes of Operation Synchronous Mode provides realtime mirroring of data between the source Symmetrix and the target Symmetrix system. Data is written simultaneously to the cache of both systems in real time before the application I/O is completed, ensuring the highest possible data availability. Semi-Synchronous Mode writes data to the source system, completes the I/O, and then synchronizes the data with the target system. Since the I/O is completed prior to synchronizing data with the target system, this mode provides an added performance advantage. A second write will not be accepted on a volume until the target has been synchronized. Adaptive Copy Mode transfers data from the source volumes to the remote volumes without waiting for an acknowledgment. This is recommended for transferring large amounts of data, such as during data center migrations or consolidations. All modes can co-exist simultaneously on Symmetrix, allowing application of the most appropriate mode to individual data volumes based on speci c requirements. SRDF´s implementation and maintenance are easy and cost-effective. No special application coding is required and no CPU overhead is incurred. SRDF functions independently from the host processor. Set-up and installation parameters of the SRDF function are accomplished through the Symmetrix integrated service processor. Symmetrix Manager Control Option software may be used to configure SRDF implementations from any location through an Operational Modes Synchronous 100% synchronous remote mirroring Semi-Synchronous Remote mirroring with maximum I/O lag of 1 per volume Adaptive Copy Remote mirroring for extensive data transfers Domino Remote mirroring for database management systems Performance may vary based on distance and mode of operation. Remote Mirroring Connectivity* Dedicated remote link directors (RLDs) Minimum 2 to maximum 16 links per system ESCON-compliant multimode fiber Physical interfaces: 62.5/125 or 50/125 micrometer LED ESCON-compliant single mode fiber (via LED/laser conversion) 9191, 9032, 9033, and 9036 device support (66 km maximum distance) T1/E1, T3/E3 and ATM protocol support (extended distance) T1/E1, T3/E3 and ATM connectivity provided via Computer Network Technologies, InRange Technology's GSN StorageTek (formerly NSG) Wave Division Multiplexing supported with InRange Technology and Computer Network Technologies Host Connectivity and Emulation Serial (ESCON) channels Parallel (BMX) channels 3990-3 storage control emulation 3390/3380/FBA device emulation FWD SCSI Ultra SCSI Fibre Channel AS/400® 9337-480 emulation AS/400 load source emulation Configuration Management Source, target, and local volume types in each Symmetrix system Unidirectional mirroring (electronic vault) Bidirectional mirroring available (ESCON systems only) Nondisruptive configuration changes User-selectable read-only access on target volumes Target system enabled for full read/write access on command Service processor and optional host-based status and configuration control Error Reporting SIMs message reporting to host console Full Symmetrix Auto-Call and Remote Support Facility coverage Kľúčové vlastnosti Local/campus solution Local/remote mirroring via ESCON-compliant fiber optics Extended distance solution SRDF FarPoint provides remote mirroring via ESCON to T1/E1, T3/E3 and ATM interfaces Hlavné prínosy Performance boost of up to 25% with 5265 microcode* Host-independent remote mirroring operations Source/target role switching capability Ability to multi-hop mirrored data onto a third Symmetrix system Remote management of targets from the source Automatic recovery from HDA or link failure Automatic resynchronization following HDA or link repair All Symmetrix 3000 and 5000 family configurations supported (similar and mixed) User-selectable configuration options Recovery Symmetrix unit becomes available for processing on service processor or via Symmetrix Manager Control Option Copyright 2007 COMPAREX. 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