Solaris 8 internal Drives malfunctioning !!!

Hi Gurus,

I am experiencing a different problem. I have v880 server with 3 JBODs. and
6 internal Disk 2 for rootvg and 2 for internal_mirrordg and 2 is kept
idle.

One of the internal_mirrordg disk failed. I have logged a call and engg
pulled out the disk and I found root disk got pulled. I asked engg to put
back the disk and made rootdg available and put one of the idle disk to
that DG and brought it up.
Then I got downtime today and asked engg to power off and replace disk.
Server didn't boot as it said boot disk not found, again I pushed back the
old disk. Now server is working.

I have guided engg to remove the disk with the serial number which was
taken from iostat -En.

Has anyone faced this type of issue?

Please advise. Solaris 8