InfoScale™ 9.0 Storage Foundation Administrator's Guide - AIX

Removing a disk from a disk group

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

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

If a disk contains no subdisks, you can remove it from its disk group with the following command:

# vxdg [-g diskgroup ] rmdisk diskname

For example, to remove mydg02 from the disk group mydg, enter the following:

# 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 lets you remove the disk even if it has subdisks.

See the vxdg(1M) manual page.

After you remove the disk from its disk group, you can (optionally) remove it from VxVM control completely. Enter the following:

# vxdiskunsetup devicename

For example, to remove the disk hdisk9 from VxVM control, enter the following:

# vxdiskunsetup hdisk9

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 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 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.