Reducing the native rootvg that is enabled for DMP

Description

Reducing the native rootvg that is enabled for DMP

See Administering the root volume group (rootvg) under DMP control

When a native root volume group (rootvg) is enabled for DMP, and contains multiple SAN disks, you can reduce the rootvg. Use this procedure to remove a SAN disk from a rootvg that includes multiple SAN disks. This procedure can be done online, without requiring a reboot.

To remove a SAN disk from a DMP-enabled rootvg

  1. View the rootvg configuration. If the configuration contains multiple SAN disks, you can remove one.

    # lsvg -p rootvg
    PV_NAME      PV STATE    TOTAL PPs  FREE PPs  FREE DISTRIBUTION
    emc0_0039    active      73         8         00..00..00..00..08
    emc0_00a7    active      15         15        03..03..03..03..03
    # lspv | grep -w rootvg
    emc0_00a7     00c398ed00008e79     rootvg     active
    emc0_0039     00c398edf9fae077     rootvg     active
  2. Remove the SAN disk from the DMP-enabled rootvg.

    # reducevg rootvg emc0_00a7
  3. Verify that the DMP device is removed from the DMP rootvg configuration. For example:

    # lsvg -p rootvg
    PV_NAME      PV STATE    TOTAL PPs  FREE PPs  FREE DISTRIBUTION
    emc0_0039    active      73         8         00..00..00..00..08
    # lspv | grep -w rootvg
    emc0_0039     00c398edf9fae077     rootvg     active

    The list of physical volumes available to LVM shows the paths to the DMP device.

    # lspv
    emc0_00a8     00c398ed0002130f     None
    emc0_027d     00c398ed81c8d706     None
    emc0_00a4     00c398ed000c6d98     None
    emc0_00a5     00c398ed000d6a84     None
    emc0_00a9     00c398ed000204d8     None
    emc0_00a7     00c398ed00008e79     None
    emc0_0039     00c398edf9fae077     rootvg

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