What is the current state of the mirrored disk as in "vxdisk -o alldgs list" ?
Assuming the state as "Failed", the spare disk is of same as size as rootdisk and failed mirror disk has been physically reemoved and not seen by volume manager.
1.> Initialize the failed disk:
# vxdisksetup -if <spare disk> format=sliced
2.> Add the spare disk into the disk group configuration.
# vxdg -k -g <root dg name> adddisk <disk access name>=<disk media name>
Note: You need to provide the same "disk access name" as it was with the failed mirror disk.
3.> You may run "vxrecover -bsE -g < root dg name>" to bring mirror disk with the sync of root disk.
Things may not alwyas be straight forward like this as their are various intermidiate state that volume manager can get into hence best to seek Symantec Technical Support at the time of any such failure specially if user is new to this product.
Regards,
Dev
