VERITAS Volume Manager 3.1 Storage Administrator Administrator's Guide

Troubleshooting
Volume Troubleshooting
Chapter 6240
may be disconnected.
• Make sure that the physical disks are turned on, plugged in, and
attached to the computer. Repair any disk, controller, or cable
problems. Scan the disks on the system (Hosts > Scan Disks) to make
sure that the Volume Manager recognizes any newly attached
hardware. To return the RAID-5 volume to a healthy state, recover
the volume.
• If there has been a partial or complete disk failure, either replace the
disk or move the affected subdisks to another disk.
Volume State: Unusable
The RAID-5 volume is unusable. This usually occurs when there is a
double disk failure (that is, when two subdisks in the same stripe or the
parity and one subdisk in a stripe are damaged or inaccessible). The
underlying disks may have failed or become inaccessible.
• Make sure that the physical disks are turned on, plugged in, and
attached to the computer. Repair any disk, controller, or cable
problems. Scan the disks on the system (Hosts > Scan Disks) to make
sure that the Volume Manager recognizes any newly attached
hardware. Run the following command to reattach the disks to their
disk group:
/etc/vx/bin/vxreattach [ device_name ]
To return the RAID-5 volume to a healthy state, recover the volume.
• If two of the volume’s disks have failed, the RAID-5 volume’s data is
unusable. Replace the failed disks and then try to restart the volume
by running the following command:
vxvol -f start volume_name
Restore the volume from backup.
To prevent this problem in the future, enable logging for RAID-5
volumes.