Solaris

I'm not sure what you are asking here.

Both of the local disks that show up in format also show up in cfgadm.

Thank you for reply, question is how to unconfigure disk from solaris 10. ( failed disk was part of SVM mirror)

If you see format closely,

that is not normal and it was clear from metastat output that c2t1d0 had write errors.

It is mentioned somewhere that one has to unconfigure using cfgadm -c faulty disk and then put new one and then do meta attach. if this(cfgadm unconfigure / configure) step is not rquired then I don't care.

I am not able to do this step

In this case

c2::2100000087140f53 is your attachment point ( look at the path on the line after the disk name and compare the identifiers )

correct but then when I try,

You can skip the cfgadm unconfigure step and proceed to pull out the disk. Nothing would happen. just run devfsadm -C after you pull out and after you put in new disk and cont with your steps.
usually cfgadm is used for scsi disks. V480 uses fcal disk if im not wrong.

Thank you very much Incredible, you sure are incredible

Your reply filled me with me confidance, I am going to proceed with these 2 steps tomorrow morning.