It sounds like you have deleted the pool but the Storage Server still exists and what ever command you are running wants to recreate it, possibly with the same name if a difference case? (Upper / Lower)

As it sounds like the Storage Server is still active just use the Storage Pool Wizard to create your new pool on the existing Storage Server so that all you are doing is creating the pool and not trying to create the Storage Server again

Let us know how this goes

When I tried to run Storage Pool Wizard to create your new pool on the existing Storage Server.. getting error

RDSM has encountered an issue with STS where the server was not found :- getDiskVolumeInfoList

Please find attached file for screenshot of error:-

OK - I assume that this storage server is not used for anything else so delete it first:

nbdevconfig -deletests -storage_server servername -stype PureDisk

or look through these for ideas:

http://www.symantec.com/docs/HOWTO35968
http://www.symantec.com/docs/TECH130869

,After run above command .. storage server has been deleted , but when I'm trying to configure storage server its giving Authorization error ,verify username/password. even I'm using correct user name and password .

Seems that some steps were missed during removal of initial MSDP components.

Best to open a support call to get assistance with cleanup.

Check for any signs of that server anywhere - i have seen similar to this and there was something left that caused the issue (storage unit or similar)

Once everything had been cleared out try again

Check the Media and Device Mangement - Credentials - Storage Servers section of the Admin Console to make sure it doesn't still appear in there