Powering on external storage system, I/O at secondary site (GAD+UR)

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

Procedure

  1. Power on the external storage system.

  2. Confirm that the primary and secondary storage systems and the external storage system for the quorum disk do not have any blocked parts.

    If any parts are blocked, recover them.

  3. Check for SIMs about path blockage, and delete the SIMs.

  4. On the primary and GAD secondary storage systems, establish the connections to the quorum disks.

    Command example: raidcom check_ext_storage external_grp -ldev_id 0x8888 -IH1

  5. On the primary and GAD secondary storage systems, confirm that the connections to the quorum disks have been established.

    Command example: raidcom get external_grp -external_grp_id 1-2 -IH1

  6. Confirm that the external volumes of the primary and GAD secondary storage systems are recognized as quorum disks.

    Command example: raidcom get ldev -ldev_id 0x8888 -IH1

  7. On the primary and GAD secondary storage systems, check for SIMs about quorum disk blockade, and delete the SIMs.

  8. Wait for more than 5 minutes after completing step 4, and then resynchronize the GAD pairs on the GAD secondary storage system by specifying the S-VOL (swap resync).

    Command example: pairresync -g oraHA -swaps -IH1 A volume on the primary storage system changes to an S-VOL, and a volume on the secondary storage system changes to a P-VOL.

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

    Pair type

    Before the GAD pair resync

    After the GAD pair resync

    P-VOL

    S-VOL

    P-VOL

    S-VOL

    GAD pair

    PSUS (Block)

    SSWS (Local)

    PAIR (Mirror(RL))

    PAIR (Mirror(RL))

    UR delta resync pair

    PSUE1

    SSUS2

    PSUE1

    SSUS2

    UR pair

    PAIR

    PAIR

    PAIR

    PAIR

    Notes:

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

  10. Keep updating I/O to P-VOL or GAD S-VOL for two minutes.

    The information on the system configuration is reported among the primary, GAD secondary, and UR secondary storage systems. At the time, the UR delta resync pair status is changed from PSUE to PSUS. The mirror status of the journal is displayed as PJNS. Confirm that no failure SIMs are displayed.

Next steps

The GAD P-VOL and S-VOL are reversed compared to the original configuration (before the planned outage). To restore the original configuration, reverse the GAD P-VOL and S-VOL.

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