IT39382: HYPER-V VM RESTORE APPEARS TO HANG WHILE READING FROM A TAPE VOLUME

APAR status

• Closed as program error.

Error description

• A virtual machine (VM) restore using IBM Spectrum Protect for
  Virtual Environments - Data Protection for Microsoft Hyper-V
  does not progress. When listing open sessions for the affected
  node, one session is waiting for a sequential tape volume which
  is in use by another session for the affected node. Both
  sessions have spent about an equal time in the IdleW and in the
  MediaW state.
  
  
  The output of a server's Query Session Format=Detail command
  will include information similar to the following:
  Sess  Sess    Wait  Media Access Status
  
  Number State    Time
  
  ------ ------ ------ ---------------------------------------
  nn,nn1 IdleW  4.9 H  Current input volumes:  VOLUME1,(17751
                       Seconds)
  nn,nn2 MediaW 4.9 H  Waiting for input volume(s):
                       VOLUME1,(17734 Seconds)
  
  
  In the example above sessions nnnn1 and nnnn2 are open for the
  same node.
  When the wait time of the first session (nnnn1) reaches the
  value of the server's IDLETimeout option, the first session will
  
  be forced to close and the second session can continue reading
  from the volume.
  
  The restore process can then complete.
  
  =======================
  Affected product versions:
  IBM Spectrum Protect for Virtual Environments
  - Data Protection for Microsoft Hyper-V versions 7.1 and 8.1
  on all supported Windows platforms
  
  
  =======================
  Additional Keywords:
  
  TS005787317 tsm hyperv tdpve tape vtl library hung
  

Local fix

• Temporarily lower the server option IDLETimeout.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * IBM Spectrum Protect for Virtual Environments component Data *
  * Protection for Microsoft Hyper-V 7.1.6, 7.1.8, 8.1.4, 8.1.6, *
  * 8.1.8, 8.1.9, 8.1.10, 8.1.11, 8.1.12 and 8.1113 on the       *
  * Windows Server platform.                                     *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * This issue is projected to be fixed in the IBM Spectrum      *
  * Protect Data Protection for Microsoft Hyper-V client 8.1.14  *
  * version on Windows platform.                                 *
  * Note that this is subject to change at the discretion of     *
  * IBM.                                                         *
  ****************************************************************
  

Problem conclusion

• Data Protection for Microsoft Hyper-V use multiple sessions with
  server to restore virtual machine. When virtual machine is
  stored on a sequential tape volume client can run into situation
  when one session is waiting for a sequential tape volume which
  is in use by another session for the affected node. The code has
  been modified to avoid getting into such locks
  

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:

Modules/Macros

• DSM      DSMC     DpHv
  

Fix information

• Fixed component name

  TSM VE DP MS HY

• Fixed component ID

  5725TVEHV

Applicable component levels