Check the error in Tara  Check for the error Storage Agent log file located in /opt/tivoli/tsm/StorageAgent/log/dsmsta.log 2017-12-04 05:58:01 ANR0511I Session 10325 opened output volume B06106L3. ANR0408I Session 10352 started for server TSMPROD04 (AIX) (Tcp/Ip) for library sharing. ANR0409I Session 10352 ended for server TSMPROD04 (AIX). 2017-12-04 05:59:01 2017-12-04 06:00:01 2017-12-04 06:01:01 ANR0514I Session 10327 closed volume B06104L3. ANR0454E Session rejected by server TSMPROD04, reason: 201 - Communication Failure. ANR9778E Unable to establish a communication session with the primary library manager. ANR8336I Verifying label of LTO volume B06104L3 in drive BL2DRV37 (/dev/lin_ta- pe/by-id/rmt3_6921037). ANR8468I LTO volume B06104L3 dismounted from drive BL2DRV37 (/dev/lin_tape/by-- id/rmt3_6921037) in library VTLBL2. ANR3174E Communication error with managed server TSMPROD04. ANR0479W Session 7678 for server TSMPROD04 (AIX) terminated - connection with server severed. ANR0454E Session rejected by server TSMPROD04, reason: 201 - Communication Failure. ANR9778E Unable to establish a communication session with the primary library manager. ANR0479W Session 10328 for server TSMPROD04 (AIX) terminated - connection with server severed.
Solution: The error indicate problem in TSM, contact with server people who are managing TSM. In our case TSM dies due to pagingspace and after started it the problem fixed. Don’t forget to release the Hut lock if its not already released. We have script to release Hut lock that I used to release Hut lock by lunching it from Tara. Selected the Script from Tara  Click Launch  Here is the script 
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