status 2106 "Disk volume is down", reauthorizing each media server to the storage server

check this link out..

https://www-secure.symantec.com/connect/forums/netbackup-7504-datadomain-and-status-2106

I quote from that:

" here under is extract to add and update credentials for OpenStorage based devices

(Add OpenStorage credentials)
   tpconfig -add -storage_server <server name> -stype <server type>
            [-proxy <proxy server name>]
            -sts_user_id <user ID> [-password <password>]
            [-st <storage type>]
            Valid values for storage type (can be added together)
             Formatted Disk = 1 (DEFAULT)
             Raw Disk = 2
             Direct Attached = 4
             Network Attached = 8 (DEFAULT)

(Update OpenStorage credentials)
   tpconfig -update -storage_server <server name> -stype <server type>
            -sts_user_id <user ID> [-password <password>]