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Extended Distance Replication With MirrorView / A

MirrorView/A with Delta Set technology enables efficient replication by only transferring changed blocks during update cycles. It ensures consistent and atomic updates, protects against partial update scenarios, and supports extended distance data mirroring.

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Extended Distance Replication With MirrorView / A

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  1. Extended Distance Replication With MirrorView / A

  2. MirrorView / A Asynchronous Replication via Delta Sets • Delta Set technology lowers bandwidth requirement • Uses delta technology to create “Delta Set” for incremental update • Replicates only the changed blocks during MirrorView / A update cycle • Automatic update • Disk-based Delta Set is sent to target periodically • Customer-defined update frequency • “Gold Copy” protection • Target automatically protected via “point-in-time” golden copy during the update cycle • Ensures atomic update • Protection against partial update scenarios Periodic Transport of Delta Set Source Target Delta Set Gold Copy

  3. MirrorView / A – Features • Data replication is decoupled from host I/O • Eliminates I/O latency overhead associated with synchronous solutions • Maintains consistent copy of data at all times • Guaranteed consistency across a set of LUNs in the system via consistency groups • Gold Copy protection on the secondary side • Extended distance data mirroring solution • Incremental tracking and update capability • Resilient to high latency networks • Minimum network link supported is T1 • Supported systems: CX3-80, CX3-40, CX700, CX600, CX500, CX400

  4. 11A.M. 10 AM 9 AM Reserved LUN Pool COFW* COFW Transfer Map Gold Copy (9AM) A B C D MV/A MV/A 9 A.M. 9 A.M. 11A.M. 11A.M. * COFW : Copy On First Write 1 0 0 1 MirrorView / A – Implementation Host I/O ( A -> A’) Host I/O ( D -> D’) Source LUN A’ A B Target LUN A’ A A B B C D’ D C C D D’ D Tracking Map 1 0 0 0 0 0 1 0 Update Freq = 2 hrs A’ D’ Delta Set IP/SAN Source Site (Orlando, FL) Target Site (Anaheim, CA)

  5. MirrorView / A – Storage System based Consistency Groups • MirrorView / A mirrors are grouped for • Operations: Synchronization, promote, fracture • Applications • Database consistency • Prevents rolling disaster scenario • Atomic update across all the members of the consistency group • A Gold Copy of all the secondary mirrors is maintained for protection during group update • All the members (primary or secondary) must reside within the same storage system

  6. Understanding ConsistencyThe Dependent Write I/O Principle • The logical dependency between write I/Os; that is embedded by the logic of an application, operating system, or database management system • A write I/O that will not be issued by an application until a prior related write I/O has completed • Alogical dependency, not a time dependency • Inherent in all Database Management Systems (DBMS) • Page (data) write is dependent write I/O based on a successful log write • Ensuring ‘dependent write consistency’ is the basic principle behind all of EMC’s Consistency Technology solutions • Enterprise SRDF Consistency Groups • Enterprise TimeFinder Consistent Split • EMC Consistent SNAPs and Consistent Clones • SRDF/A • MirrorView/A

  7. MirrorView/A Storage System based Consistency Groups & Databases • MirrorView / A Consistency Groups (CG) • During periodic update • Does not require the application to be stopped • Supports database software restart feature after a power failure • On source side • Creates consistent split across all the members of the CG • Momentarily freezes I/O for all the members for the CG to create a point-in-time view • Prevents dependent I/O from getting out of sync • On target side • Apply Delta Set update atomically across all the members of the CG • All the members are protected with Gold Copy • Creates a restartable point-in-time view of the data

  8. Atomic Operation Across all Members Log Src2 Log Src1 DB Src2 DB Src1 Log Trgt2 Log Trgt1 DB Trgt2 DB Trgt1 Gold Copy Gold Copy Gold Copy Gold Copy Delta Set Delta Set Delta Set Delta Set MV/A MV/A MirrorView/A Consistency Group MirrorView/A Storage System based Consistency Groups – Implementation IP/SAN Source Site (Orlando, FL) Target Site (Anaheim, CA)

  9. MirrorView / A – Consistency Group Operations

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