Powering off the external storage system, I/O at primary site (GAD+UR)

Use the following procedure to power off the external storage system when server I/O continues to the primary storage system in a GAD 3DC delta resync environment.

Procedure

  1. Using the alternate path software, stop I/O from servers to the GAD secondary storage system.

    Direct server I/O to the primary storage system.

  2. On the primary storage system, resynchronize the GAD pair by specifying the P-VOL.

    Command example: pairsplit -g oraHA -IH0

  3. Confirm that the pair statuses are changed as shown in the following table.

    Pair type

    Before the GAD pair suspension

    After the GAD pair suspension

    P-VOL

    S-VOL

    P-VOL

    S-VOL

    GAD pair

    PAIR (Mirror(RL))

    PAIR (Mirror(RL))

    PSUS (Local)

    PSUS (Block)

    UR pair

    PAIR

    PAIR

    PAIR

    PAIR

    UR delta resync pair

    PSUS1

    SSUS1

    PSUE2

    SSUS1

    Notes:

    1. Device Manager - Storage Navigator displays HOLD.
    2. Device Manager - Storage Navigator displays HOLDING.

  4. On the primary and GAD secondary storage systems, disconnect the quorum disks.

    Command example: raidcom disconnect external_grp -ldev_id 0x9999 -IH0
    NoteWhen you disconnect a quorum disk, SIM (def0zz) (quorum disk blockade) might be issued (zz: quorum disk ID). If this SIM is issued, delete the SIM after powering on the storage system and reconnecting the quorum disk.

  5. Power off the external storage system.

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