IT36100: MANY SESSIONS ARE OPENED AND CLOSED WITHIN A LANFREE ENVIRONRMENT TO A LIBRARY MANAGER.

8.1.12.000-IBM-SPSRV-WindowsX64
8.1.12.000-IBM-SPSRV-Linuxx86_64
8.1.12.000-IBM-SPSRV-Linuxs390x
8.1.12.000-IBM-SPSRV-Linuxppc64le
8.1.12.000-IBM-SPSRV-AIX
IBM Spectrum Protect Server V8.1 Fix Pack 12 (V8.1.12) Downloads

APAR status

• Closed as program error.

Error description

• Problem Description:
  
  A LAN-FREE backup requires the library client to check and
  verify LAN-FREE path resources which are available on the
  library manager.
  The library client needs to access the storage pool and gets
  information from the storage pool cache about the resources.
  This issue can be seen in an environment that has large number
  of  LAN-FREE agents and number of library clients.
  
  This problem is caused because the server does not use a mutex
  to serialize the access of the storage pool for each library
  client, which
  leads to an increasing number of sessions seen on the library
  manager when a path resource is not available.
  Without the mutex/lock, all library clients can access the path
  cache based on the same storage pool to do the same checking.
  This makes this cache ineffective and causes a performance issue
  due to the quantity of sessions that can be quickly opened and
  closed to check the cache for path resources.
  
  Symptom:
  
  The following an huge excessive number of ANR0408I and ANR0409I
  messages entries up to few thousands  would be logged in the
  activity log.
  The activity log messages look like:
  
  ANR0408I Session <sessionid> started for server <SERVER>
  (<PLATFORM>) (<COMMTYPE>) for library sharing. (SESSION:
  <sessionid>)
  ANR0409I Session <sessionid> ended for server <SERVER>
  (<PLATFORM>). (SESSION: <sessionid>)
  are reported in the activity log.
  
  
  Spectrum Protect Versions Affected:
  
  Server versions 7.1.x and 8.1.x on all supported platforms
  
  Initial Impact:
  
  Medium
  
  Additional Keywords:
  
  Spectrum Protect Server, LAN-FREE, cache, sessions
  

Local fix

• Local Fix:
  
  This situation can leads that we can reach defined the maximum
  MAXSESSION parameter which should be increased.
  issue setopt maxsessions - server side option which specifies
  total number of sessions, client and server, that can run at any
  one time
  or we have to recycle the library manager to clear the sessions,
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All IBM Spectrum Protect server users of LANFREE backup.     *
  *                                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See error description.                                       *
  *                                                              *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Apply fixing level when available.                           *
  * This problem is currently projected to be fixed in level     *
  * 8.1.12.                                                      *
  * Note that this is subject to change at the discretion of     *
  * IBM.                                                         *
  *                                                              *
  ****************************************************************
  

Problem conclusion

• This problem was fixed.
  Affected platforms for reported release:  AIX, HP-UX, Linux,
  Solaris, and Windows.
  Platforms fixed:  AIX, Linux, and Windows.
  

Temporary fix

Comments

APAR Information

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

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

Fix information

• Fixed component name

  TSM SERVER

• Fixed component ID

  5698ISMSV

Applicable component levels

• R81A PSY

     UP

• R81L PSN

     UP

• R81W PSY

     UP

• R71A PSY

     UP

• R71H PSY

     UP

• R71S PSY

     UP

• R71L PSY

     UP

• R71W PSY

     UP

• R63A PSY

     UP

• R63H PSY

     UP

• R63L PSY

     UP

• R63S PSY

     UP

• R63W PSY

     UP