HP-UX System Administrator's Guide: Logical Volume Management HP-UX 11i v3 (B3921-90053 September 2011) Transform used: ESS version 2.2

NOTE: If the system was rebooted to replace the failed disk, then ioscan –m lun does
not display the old disk.
6. Assign the old instance number to the replacement disk.
For example:
# io_redirect_dsf -d /dev/disk/disk14 -n /dev/disk/disk28
This assigns the old LUN instance number (14) to the replacement disk. In addition, the device
special files for the new disk are renamed to be consistent with the old LUN instance number.
The following ioscan –m lun output shows the result:
# ioscan –m lun /dev/disk/disk14
Class I Lun H/W Path Driver S/W State H/W Type Health Description
========================================================================
disk 14 64000/0xfa00/0x1c esdisk CLAIMED DEVICE online HP MSA Vol
0/1/1/1.0x3.0x0
/dev/disk/disk14 /dev/rdisk/disk14
The LUN representation of the old disk with LUN hardware path 64000/0xfa00/0x0 was
removed. The LUN representation of the new disk with LUN hardware path
64000/0xfa00/0x1c was reassigned from LUN instance 28 to LUN instance 14 and its
device special files were renamed as /dev/disk/disk14 and /dev/rdisk/disk14.
7. Restore LVM configuration information to the new disk.
For example:
# vgcfgrestore -n /dev/vgnn /dev/rdisk/disk14
8. Restore LVM access to the disk.
If you did not reboot the system in Step 2, “Halt LVM access to the disk,” reattach the disk as
follows:
# pvchange –a y /dev/disk/disk14
If you did reboot the system, reattach the disk by reactivating the volume group as follows:
# vgchange -a y /dev/vgnn
NOTE: The vgchange command with the -a y option can be run on a volume group that
is deactivated or already activated. It attaches all paths for all disks in the volume group and
resumes automatically recovering any disks in the volume group that had been offline or any
disks in the volume group that were replaced.
Therefore, run vgchange only after all work has been completed on all disks and paths in
the volume group, and it is necessary to attach them all.
Disk Troubleshooting and Recovery Procedures 133