How to Replace(rootvg & non-rootvg) disk in AIX:

Procedure 1: Disk Replacement when the Volume Group is Mirrored

1. Remove all copies from disk:
   1	# unmirrorvg vg_name hdiskX

2. Remove disk from volume group:
   1	# reducevg vg_name hdiskX

3. Remove disk from ODM:
   1	# rmdev -l hdiskX -d

4. Connect new disk to system (use Hot Plug Disk Replacement Procedure)  (May have to shut down if not hot-pluggable)
5. Add new disk to volume group:
   1	# extendvg vg_name hdiskY

6. Create new copies:
   1 2	# mirrorvg vg_name hdiskY # syncvg vg_name

Procedure 2a: Disk Still Working in non-rootvg

1. Connect new disk to system
2. Add new disk to volume group:
   1	# extendvg vg_name hdiskY

3. Migrate old disk to new disk: (*)
   1	# migratepv hdiskX hdiskY

4. Remove old disk from volume group:
   1	# reducevg vg_name hdiskX

5. Remove old disk from ODM:
   1	# rmdev -l hdiskX -d

Procedure 2b: Disk Still Working in ROOTVG

1.  Connect new disk to system
2. Add new disk to volume group
   1	extendvg rootvg hdiskY

3. Disk contains hd5 ?
   1 2 3 4

   # migratepv -l hd5 hdiskX hdiskY # bosboot -ad /dev/hdiskY # chpv -c hdiskX # bootlist -m normal hdiskY

4. Migrate old disk to new disk:
   1	# migratepv hdiskX hdiskY

5. Remove old disk from volume group
   1	reducevg rootvg hdiskX

6. Remove old disk from ODM
   1	# rmdev -l hdiskX -d

Procedure 3: Disk in Missing or Removed State

1. Identify all LVs and file systems on failing disk:
   1	# lspv -l hdiskY

2. Unmount all file systems on failing disk:
   1	# umount /dev/lv_name

3. Remove all file systems and LVs from failing disk
   1 2	# rmfs # rmlv lv_name

4. Remove disk from volume group:
   1	# reducevg vg_name hdiskY

5. Remove disk from system:
   1	# rmdev -l hdiskY -d

6. Add new disk to volume group:
   1	# extendvg vg_name hdiskZ

7. Re-create all LVs and file systems on new disk:
   1 2	# mklv -y lv_name # smit crfs

8. Restore file systems from backup:
   1	# restore -rvqf /dev/rmt0

Procedure 4: Total rootvg Failure

1. Replace bad disk (Use Hot Plug Disk Replacement Procedure)
2. Boot in maintenance mode
3. Restore from a mksysb tape
4. Import each volume group into the new ODM (importvg) if needed

Procedure 5: Total non-rootvg Failure

1. Export the volume group from the system:
   1	# exportvg vg_name

2. Check /etc/filesystems
3. Remove bad disk from ODM and the system:
   1	# rmdev -l hdiskX -d

4. Connect new disk
5. If volume group backup is available (savevg):
   1	# restvg -f /dev/rmt0 hdiskY

6. If no volume group backup is available, Recreate Volume groups(mkvg), Logical volumes and File systems(mklv, crfs)
7. Restore data from a backup:
   1	# restore -rqvf /dev/rmt0