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Removing a disk from a disk group

Before you can remove the last disk from a disk group, you must disable the disk group.

See "Disabling a disk group" on page 217.

As an alternative to disabling the disk group, you can destroy the disk group.

See "Destroying a disk group" on page 217.

A disk that contains no subdisks can be removed from its disk group with this command:

# vxdg [-g diskgroup] rmdisk diskname

For example, to remove mydg02 from the disk group, mydg, use this command:

# vxdg -g mydg rmdisk mydg02

If the disk has subdisks on it when you try to remove it, the following error message is displayed:

VxVM vxdg ERROR V-5-1-552 Disk diskname is used by one or more subdisks

Use -k to remove device assignment.

Using the -k option allows you to remove the disk even if subdisks are present. For more information, see the vxdg(1M) manual page.

Warning: Use of the -k option to vxdg can result in data loss.

Once the disk has been removed from its disk group, you can (optionally) remove it from VxVM control completely, as follows:

# vxdiskunsetup devicename

For example, to remove the disk sdc from VxVM control, use this command:

# vxdiskunsetup sdc

You can remove a disk on which some subdisks of volumes are defined. For example, you can consolidate all the volumes onto one disk. If you use vxdiskadm to remove a disk, you can choose to move volumes off that disk. To do this, run vxdiskadm and select item 3 (Remove a disk) from the main menu.

If the disk is used by some volumes, this message is displayed:

VxVM ERROR V-5-2-369 The following volumes currently use part of disk mydg02:

home usrvol

Volumes must be moved from mydg02 before it can be removed.

Move volumes to other disks? [y,n,q,?] (default: n)

If you choose y, then all volumes are moved off the disk, if possible. Some volumes may not be movable. The most common reasons why a volume may not be movable are as follows:

If vxdiskadm cannot move some volumes, you may need to remove some plexes from some disks to free more space before proceeding with the disk removal operation.