To Replace Attached Physical Volumes - HP StorageWorks 2300 - Disk System Configuration

To Replace Attached Physical Volumes

Use the following commands to reduce any logical volumes that have mirror copies on the faulty disk and to
recreate the mirror extents once the disk has been replaced. Commands to recover from a host failure are
included with most steps.
Note The way that mirrors span several disks may not be duplicated exactly. For cases where the original
mirror layout must be preserved, consider deactivating the volume group with the vgchange command and
using the procedure for replacing unattached physical volumes.
Step 1
Enter the following command to reduce the mirror:
# lvreduce -m <mirror_copies> -A n <LV name> <physical volume path>
For example, to reduce a two-way mirror:
# lvreduce -m 0 -A n /dev/vg00/lvol4 /dev/dsk/c2t4d0
For a three-way mirror:
# lvreduce -m 1 -A n /dev/vg00/lvol5 /dev/dsk/c2t4d0
If the host fails during this step, execute an lvdisplay command to determine if the lvreduce command
succeeded. If the command did not succeed, execute the command again. Perform any other lvreduce
commands that were not executed before the system failed. Then proceed.
Note An important effect of the lvreduce command is that the LVM configuration backup file used by the
vgcfgrestore command is updated. If this replacement procedure is being performed now on another host
system and there is no need to execute any lvreduce commands, then the configuration file is not updated.
The LVM configuration is correct on the physical volumes, however, so the configuration file can be updated
with the vgcfbackup command.
Step 2
Physically replace the disk.
Note The procedure is detailed below in the Disk Replacement Procedure section, as well as on the Disk
Replacement Sheet provided with the replacement drive.
Step 3
Execute IOSCAN to verify that the new disk drive is accessible and a proper replacement.
Step 4
Enter the following command to restore the LVM configuration/headers to the replaced disks from the backup
of the LVM configuration:
# vgcfgrestore -n <volume group name> <physical volume path>
For example: # vgcfgrestore -n /dev/vg00 /dev/rdsk/c2t4d0
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