PM51435: SERVER DEADLOCK MIGHT BE ENCOUNTERED DURING MIGRATION FROM DISK STORAGE POOLS WITH CACHING ENABLED

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Caching is enabled for a Tivoli Storage Manager disk storage
  pool. When a client backs up files to this storage pool, and the
  storage pool does not have enough space, then the server
  attempts to delete a batch of cached bitfiles from the pool to
  make space available.
  
  If a migration process is running at the same time as this batch
  delete of cached files there is the potential for a deadlock to
  occur between the migration and delete activity.
  
  The activity log will report occurances of
  ANR0379W A server database deadlock situation has been
  encountered; the lock request for the bf aggregate
  (superbitfile) id lock, <superbitfileid> will be denied to
  resolve the deadlock.
  If the support command SHOW DEADLOCK is used to capture the
  symptom, the following will be reported:
  ANS8000I Server command: 'SHOW DEADLOCK'
   A Deadlock was found:
   Transaction <TXN 1>.
     Waiting for Lock mode xLock on: Type=46001(bf aggregate
  (superbitfile) id), NameSpace=0, Key='<A KEY>'
     Held by transaction <TXN 2> in mode xLock.
   Transaction <TXN 2>.
     Waiting for Lock mode ixLock on: Type=47051(df bitfile root),
  NameSpace=0, Key=''
     Held by transaction <TXN 1> in mode ixLock.
  You face this symptom if you see the deadlock with the request
  for lock type 47051 while migration is running for a cached
  enabled storage pool with current client backup activity.
    Tivoli Storage Manager Versions Affected:
    Initial Impact: Medium
    Additional Keywords:  TSM
  

Local fix

• disable caching for the disk storage pool or ensure enough disk
  space exists to avoid migration needing to process while backups
  are running
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All Tivoli Storage Manager server users.     *
  ****************************************************************
  * PROBLEM DESCRIPTION: See error description.                  *
  ****************************************************************
  * RECOMMENDATION: Apply fixing level when available. This      *
  *                 problem is currently projected to be fixed   *
  *                 in levels 5.5.6. Note that this is           *
  *                 subject to change at the discretion of IBM.  *
  ****************************************************************
  *
  

Problem conclusion

• This problem was fixed.
  Affected platforms:  AIX, HP-UX, Sun Solaris, Linux, Windows
  and zOS.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IC76004

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  TSM FOR OS/390

• Fixed component ID

  5698ISMVS

Applicable component levels

• R550 PSY UK73668

     UP11/11/15 P F111

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.