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Reattaching Failed Disks in Veritas Volume Manager

Veritas volume manager troubleshooting guide info.

Reattaching failed disks
You can perform a reattach operation if a disk could not be found at system startup,
or if VxVM is started with some disk drivers unloaded and unloadable (causing
disks to enter the failed state). If the underlying problem has been fixed (such
as a cable or controller fault), use the vxreattach command to reattach the disks
without plexes being flagged as STALE. However, the reattach must occur before
any volumes on the disk are started.
The vxreattach command is called as part of disk recovery from the vxdiskadm
menus and during the boot process. If possible, vxreattach reattaches the failed
disk media record to the disk with the same device name. Reattachment places a
disk in the same disk group that it was located in before and retains its original
disk media name.
Recovering from hardware failure 19
Reattaching failed disks
To reattach a failed disk
1 Use the vxdisk list command to see which disks have failed, as shown in
the following example:

# vxdisk list
c1t1d0s2 auto:sliced mydg01 mydg online
c1t2d0s2 auto:sliced mydg02 mydg online
– – mydg03 mydg failed was: c1t3d0s2
– – mydg04 mydg failed was: c1t4d0s2

2 Once the fault has been corrected, the disks can be reattached by using the
following command to rescan the device list:
# /usr/sbin/vxdctl enable

3 Use the vxreattach command with no options to reattach the disks:
# /etc/vx/bin/vxreattach
After reattachment takes place, recovery may not be necessary unless a disk
was faulty and had to be replaced. Reattachment can fail if the original (or
another) cause for the disk failure still exists.
You can use the command vxreattach -c to check whether reattachment is
possible, without performing the operation. Instead, it displays the disk group
and disk media name where the disk can be reattached.
See the vxreattach(1M) manual page.

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