How to mirror VIOS Boot Disk?

Here is the procedure to mirror VIOs boot disk.

# lspv
NAME             PVID                 VG               STATUS
hdisk0           00c122d4341c6e62     rootvg           active
hdisk1           00cd55a4fg6b676f     None
hdisk2           00c5524409a99b77     None

Here hdisk0 is rootvg disk , now we need to check free disk.
you can use lspv -free command to check the un-mapped free disks.

$ lspv -free
NAME            PVID                                SIZE(megabytes)
hdisk1         00cd55a4fg6b676f                     256000
hdisk2         00c5524409a99b77                     256000

So In this case, hdisk1 is free and un-mapped . So we're going to use hdisk1 to mirror with hdisk0.

Add hdisk1 into rootvg:

# extendvg rootvg hdisk1 0516-1254 extendvg: Changing the PVID in the ODM.

Now mirror the disk but defer the automatic reboot:

$ mirrorios -defer hdisk1

Now check the boot list:

$ bootlist -mode normal -ls
hdisk0 blv=hd5 pathid=0

We only have hdisk0 at the moment.  Need to add hdisk1 into this:

$ bootlist -mode normal hdisk0 hdisk1

Check that worked:

$ bootlist -mode normal -ls
hdisk0 blv=hd5 pathid=0
hdisk1 blv=hd5 pathid=0

You now have a mirrored rootvg.