Replace failed mirrored internal disk in AIX

The following procedure should be used to replace a failed internal (boot) disk on AIX 5 or higher, with software mirroring.
(Note: in these examples, hdisk0 and hdisk1 are doubly-mirrored internal disks and members of rootvg; hdisk1 has failed)

1. Identify the failed disk by analyzing the errpt logs. Confirm the failure using lspv by checking if "PV State" is "Missing".

2. Break the mirror and remove the device from AIX:

# unmirrorvg rootvg hdisk1
# reducevg rootvg hdisk1
# rmdev -l hdisk1 -d

3. Confirm that the device is no longer present using lspv.

4. Replace the disk drive, letting the new device take the same device name (hdisk1).

5. Add the new device into rootvg:

# extendvg rootvg hdisk1

6. Re-mirror the volume group. No additional arguments are required to doubly-mirror the two internal disks.

# mirrorvg rootvg

7. Re-add the boot image to the new internal disk:

# bosboot -ad hdisk1

8. Re-add the new disk to the bootlist and confirm it is present:

# bootlist -m normal hdisk0 hdisk1
# bootlist -m normal -o
hdisk0 blv=hd5
hdisk1 blv=hd5