what OS ?

solaris

if server is being completely decommissioned, i would unmount devices, remove devices from volume group (if Volume manager is in use), unmask devices, make devices write disable and unmap them. Remove zones from both fabric and activate active zone set. The host can be up while you doing this ..should not matter since you are shutting it down anyway.

is this a generic process or this is followed for Solaris only..is this applicable in windows also

Thankyou....

Don't forget things like dissolving metas, removing BCV pairings and SRDF relationships too, if appropriate.

Also on some OS (such as HP/UX) you will have to do specific actions to clean up the kernel.

can you tell a few "specific actions" ? Just curous what are they?

On HP/UX, LUNs that have been removed will show up as "NO_HW" (no hardware) after an ioscan. This can be cleaned up using the rmsf command.

On Solaris, if you use the SD driver, you will want to remove the LUNs from the persistent binding file (sd.conf?).

I have used AIX for years but never with SAN disks. However, I would be surprised if the ODM doesn't need cleaning up afterwards.

Also, Powerpath will complain about LUNs it no longer sees and this should be cleaned up too.

Is there a way to see which LUNS are in use with the sd.conf file?
I have a few servers and they contain a lot of lines of every possible lun addresses.