LVM Disk Replacement

rootvg

Replacing a Working rootvg Physical Volume

1. Install and configure the new physical volume.
2. Add the new disk to the volume group.
   1. # extendvg rootvg <new_hdisk#>
3. Does the disk contain hd5 (boot partition)?
   1. # lslv -m hd5
4. No? skip to next step, yes? continue.
   1. # migratepv -l hd5 <old_hdisk#> <new_hdisk#>
   2. # bosboot -ad <new_hdisk#>
   3. # chpv -c <old_hdisk#>
   4. # bootlist -m normal <new_hdisk#>
5. Disable the system dump device.
   1. # sysdupdev -p /dev/sysdumpnull
6. Migrate data from old physical volume to new physical volume.
   1. # migratepv <old_hdisk#> <new_hdisk#>
7. Enable the system dump device.
   1. # sysdupdev -p /dev/<lv_name>
8. Remove the old physical volume from the volume group.
   1. # reducevg rootvg <old_hdisk#>
9. Remove the old physical volume from the system.

Replacing a Mirrored rootvg Physical Volume

1. Break the mirror.
   1. # unmirrorvg rootvg <old_hdisk#>
2. Remove the old physical volume from the volume group.
   1. # reducevg rootvg <old_hdisk#>
3. Remove the old physical volume from the system.
4. Install and configure the new physical volume.
5. Add the new disk to the volume group.
   1. # extendvg rootvg <new_hdisk#>
6. Mirror the volume group.
   1. # mirrorvg -S -c2 rootvg <new_hdisk#>
7. Verify the stale PPs in the volume group are 0.
   1. # lsvg rootvg | grep STALE
8. Add the ipldevice to all of the rootvg physical volumes.
   1. # bosboot -ad <new_hdisk#>
   2. # bosboot -ad <current_hdisk#> (this step will have to be repeated for each hdisk containing the ipldevice associated with rootvg.
9. Modify the bootlist to include ALL physical volumes
   1. # bootlist -m normal <new_hdisk# current_hdisk#...>

non-rootvg

Replacing a Working non-rootvg Physical Volume

1. Install and configure the new physical volume.
2. Add the new physical volume to the volume group.
   1. # extendvg <vg_name> <new_hdisk#>
3. Migrate the logical volumes to the new physical volume.
   1. # migratepv <old_hdisk#> <new_hdisk#>
4. Remove the old physical volume from the volume group.
   1. # reducevg <vg_name> <old_hdisk#>
5. Remove the old physical volume from the system.

Replacing a Mirrored non-rootvg Physical Volume

1. Break the mirror.
   1. # unmirrorvg <vg_name> <old_hdisk#>
2. Remove the disk from the volume group.
   1. # reducevg <vg_name> <old_hdisk#>
3. Remove the old physical volume from the system.
4. Install and configure the new physical volume.
5. Add the new disk to the volume group.
   1. # extendvg <vg_name> <new_hdisk#>
6. Mirror the volume group (syn in background, ensuring a copy on each disk).
   1. # mirrorvg -S -c2 <vg_name> <new_hdisk#>
7. Synchronize the volume group.
   1. # syncvg -v <vg_name>

Further Reading

1. IBM pSeries and AIX Information Center