IT41899: SPECTRUM PROTECT READ FROM CLOUD MAY HANG WHEN READCACHE IS ENABLED

8.1.17.000-IBM-SPOC-WindowsX64
8.1.17.000-IBM-SPOC-Linuxx86_64
8.1.17.000-IBM-SPOC-Linuxs390x
8.1.17.000-IBM-SPOC-LinuxPPC64le
8.1.17.000-IBM-SPOC-AIX
8.1.17.000-IBM-SPSRV-WindowsX64
8.1.17.000-IBM-SPSRV-Linuxx86_64
8.1.17.000-IBM-SPSRV-Linuxs390x
8.1.17.000-IBM-SPSRV-Linuxppc64le
8.1.17.000-IBM-SPSRV-AIX
8.1.16.100-IBM-SPSRV-WindowsX64
8.1.16.100-IBM-SPSRV-Linuxx86_64
8.1.16.100-IBM-SPSRV-Linuxs390x
8.1.16.100-IBM-SPSRV-Linuxppc64le
8.1.16.100-IBM-SPSRV-AIX
8.1.15.100-IBM-SPSRV-WindowsX64
8.1.15.100-IBM-SPSRV-Linuxx86_64
8.1.15.100-IBM-SPSRV-Linuxs390x
8.1.15.100-IBM-SPSRV-Linuxppc64le
8.1.15.100-IBM-SPSRV-AIX

APAR status

• Closed as program error.

Error description

• Spectrum Protect Server read from cloud may hang when cloud
  readcache is enabled.  The read process may include process
  restore, retrieve and node replication from cloud
  Support/customer diagnostics:
  When the issue happens, the following messages are logged in
  dsmffdc.log:
  
  
  [09-06-2022 10:32:34.708][ FFDC_GENERAL_SERVER_ERROR ]:
  (jvm.c:1873)
  com.tivoli.dsm.cloud.api.ContainerReadCache$MonitorTask
  MonitorTask Exception encountered
  java.lang.IllegalArgumentException: Comparison method violates
  its general contract!
              at java.util.TimSort.mergeLo(TimSort.java:788)
              at java.util.TimSort.mergeAt(TimSort.java:525)
              at java.util.TimSort.mergeCollapse(TimSort.java:450)
              at java.util.TimSort.sort(TimSort.java:256)
              at java.util.Arrays.sort(Arrays.java:1856)
              at java.util.ArrayList.sort(ArrayList.java:1475)
              at java.util.Collections.sort(Collections.java:188)
              at
  com.tivoli.dsm.cloud.api.ContainerReadCache.getFileHandleLRUEntr
  ies(ContainerReadCache.java:2941)
              at
  com.tivoli.dsm.cloud.api.ContainerReadCache.cleanupCache(Contain
  erReadCache.java:2761)
              at
  com.tivoli.dsm.cloud.api.ContainerReadCache.access$300(Container
  ReadCache.java:174)
              at
  com.tivoli.dsm.cloud.api.ContainerReadCache$MonitorTask.run(Cont
  ainerReadCache.java:517)
              at java.lang.Thread.run(Thread.java:822)
  

Local fix

•  Disable CloudReadCache for the cloud container storage pool.
  Restart instance if the server is affected by IT41584
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All IBM Spectrum Protect server users.                       *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See error description.                                       *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Apply fixing level when available. This problem is currently *
  * projected to be fixed in 8.1.15.100, 8.1.16.100, and 8.1.17. *
  ****************************************************************
  

Problem conclusion

• This problem was fixed.
  Affected platforms for reported release: 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