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    • Same size and emulation

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

    • CKD Stripe (RAID 1/0)

    • BCV, DRV

    • SFS

    • WORM

    • AS400, ICOS, ICL

    • Saved and virtual snap devices

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

    • Targets of snap sessions

    • Thin provision data pools

  • Other configuration restrictions:

    • Affinity groups All members of a RAID 5, RAID 6 or RAID 1 device should reside on the same affinity group. These are groups of disks (16, 8, 4 or 2 disks in a group) also called RAID groups.

    • Same disk Two mirrors of the same device should never reside on the same disk (for example, 1a:C0 – new syntax 1a:00).

    • Same port Two mirrors of the same device should never reside on the same port (for example, 1a:C – new syntax 1a:0).

    • Same loop All mirrors of the same RAID 1 device should never reside on the same disk loop (for example, 1a:C with 16a:C – new syntax 1a:0 with 16a:0).

    • Same DA All mirrors of the same RAID 1 device should not reside on the same DA (CPU) (for example, 1a).

    • Same slot All mirrors of the same RAID 1 device should not reside on the same director (slot) (for example, 1a with 1b).

    • Dual-Initiator All mirrors of the same RAID 1 device should not reside on the same dual- initiator pair (for example, 1a with 16a).

Impact of the swap procedure

Each swap performed by Optimizer is the equivalent of two TimeFinder operations. In order to minimize the effect of the swap procedure on the overall Symmetrix performance, the Symmetrix Optimizer will not include the same spindle twice in one swap group. In addition, the customer, using QOS controls, can set lower BCV priority for the STDs to be swapped, and can also plan the swap activities, using the Time Window feature, to occur on idle business time.

Symmetrix Optimizer features and best practices

Virtual LUN (LUN migration)

Virtual LUN technology is an enhancement to the Symmetrix Optimizer product that enables transparent, non-disruptive data mobility among storage tiers within the same storage system with devices of the same RAID protection scheme. Virtual LUN technology is supported for both open system and mainframe platforms and includes support for metavolumes. All swappable devices can be part of the LUN migration.

Virtual LUN technology provides users the ability to move data between high-performance disks and high- capacity disks, or to populate newly added disk drives. This delivers tiered storage capabilities within a single Symmetrix array.

The white paper EMC Symmetrix Optimizer Virtual LUN Technology – A Detailed Review describes the concepts and user interface of the VLUN migration feature, and in this document we will highlight a few technical subjects relevant to the new functionality.

EMC Symmetrix Optimizer A Detailed Review

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