Storage drive appearing as RAW in Windows Server 2008 R2

I faced an issue that a storage drive assigned from DS 3400 was appearing in RAW format.
i was unable to open it, initialize it and it asking every time to format it. as it was not in NTFS format and Windows was unable to open it, RAW format was unknown for it.

Actually the was that, the server was restarted and the IQN was changed of the server due to some issue.
after putting the IQN again in Storage issue was resolved.

The IQN of a server you can find as below.
Open ISCSI initiator and then go to Favorite Targets and there you will see the IQN.

The IQN you will put in below path on the DS3400 storage.
Open DS3400 storage console (i have IBM DS storage Manager 10)--> here you have to open the required storage, -->Host Mappings Tab-->select the required host group--->right click on Drive and select-->select Manage host port Identifiers-->Add Host port identifier information (This value and the value on server should be the same)


P.S: possibility of this is

if you rename the server.
if you change the IP.
if there is network device between SAN and Server which malfunction.