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Step 3: Copy DRV to a new location The data on the DRVs is now copied to the new location. Each RAID 5 member is copied and constructed separately from the other members and the DRV. After each member is fully constructed the configuration is changed, the system is IML’ed and only then the system continues with the next member. Throughout the whole process all RAID 5 members (except one) and the DRV are available and ready.

Step 4: DRVs are split This is the same as for mirrored devices.

RAID 6 swap steps RAID 6 device swaps do not require a DRV.

Step 1: Identify volumes to swap This is the same as for mirrored devices.

Step 2: Copy DATA to a new location Each RAID 6 member is copied and constructed separately from the other members. After each member is fully constructed the configuration is changed, the system is IML’ed and only then the system continues with the next member. Throughout the whole process all RAID 6 members (except one) are available and ready.

Legality of swaps

As a rule, Optimizer will never suggest a swap that conflicts with configuration rules as defined by the microcode, SymmWin, or the configuration groups. For the Symmetrix 3000, 4000, and 8000 hardware families, all configuration rules are static. However, for the Symmetrix DMX and RMS families, some configuration rules are static and some are more dynamic and defined in relative manner where an Optimizer swap can improve or maintain the protection level but will never decrease the protection level. (Exceptions for this might be a rollback session, where the user wants to undo a swap.)

67/68 code (Symmetrix 3000, 4000, and 8000 families) For Symmetrix 3000, 4000, and 8000 hardware families, the following rules apply:

  • Swappable devices

    • RAID 1 (mirrored volumes)

    • RDF devices with two local copies (default, can be controlled from SP)

    • Same size and emulation

  • Not swappable devices. The following devices are not swappable:

    • Parity RAID (parity and data)

    • CKD Stripe (RAID 1/0)

    • BCV, DRV

    • SFS

    • WORM

    • AS400, ICOS, ICL

    • Standard, unprotected volumes (default, can be controlled from SP)

  • Other configuration restrictions:

    • Same disk Two mirrors of the same device should never reside on the same disk (for example, 1a:C0).

    • X/Y bus Two mirrors of the same RAID 1 device should never reside on the same memory bus (for example, 1a with 3a).

EMC Symmetrix Optimizer A Detailed Review

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