Replace rootdisk on solaris

We all probably know what to do when we have a failed disk in solaris and how to replace it .But of late on M series servers before you remove a disk for replacement please unconfigure it before removal .
cfgadm -c uncofigure c1
incase of multiple disks on same controller please specify the disk eg.
cfgadm -c unconfigure c1::dsk/c1t0d0

Now ask the datacentre people to replace disk .Once done

cfgadm -c configure c1
What you may find is that it would not work or disk would not be visible and say in use then you need to do below

cfgadm -x configure_device c1
now run devfsadm and the device should be visible