VM66510: I/O ISSUED DURING VARY OFFLINE UPDATED TO WORK THROUGH RESERVES.

Obtain the fix for this APAR.

APAR status

• Closed as unreproducible in next release.

Error description

• Some I/O issued as a result of a VARY OFFLINE command to DASD
  devices do not work through a hardware reserve on another LPAR.
  So, this can cause the completion of some portions of the VARY
  OFFLINE request to hang behind reserves.  These hangs are not in
  the main processing of a VARY command issued by the end user but
  could result in hangs for future commands or VARY OFFLINE
  requests created by the system.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of GDPS and devices exploiting         *
  *                 reserve/release                              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  Some I/O issued as a result of actions taken during VARY OFFLINE
  commands to DASD devices have the potential to be delayed due to
  a hardware reserve held for the device by another LPAR.  In some
  instances, this can result in the unexpected delay of VARY
  OFFLINE operations requested by the HYPERSWAP RESUME command.
  

Problem conclusion

Temporary fix

• FOR RELEASE VM/ESACP/ESAR710 :
  PREREQ: VM66243
  CO-REQ: NONE
  IF-REQ: NONE
  FOR RELEASE VM/ESA CP/ESA R720 :
  PREREQ: VM66449
  CO-REQ: NONE
  IF-REQ: NONE
  

Comments

• Several I/O issued in response to actions of the VARY OFFLINE
  command were updated to use an equivalent I/O operation which
  would not be delayed due to a reserve held by another LPAR.
  This prevents the potential for delays in the processing of
  VARY OFFLINE requests.
  

APAR Information

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

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

  UM35852 UM35853

Modules/Macros

• HCPDPC   HCPSDV
  

Fix information

• Fixed component name

  VM CP

• Fixed component ID

  568411202

Applicable component levels

• R710 PSY UM35852

     UP21/04/22 P 2201

• R720 PSY UM35853

     UP21/04/22 P 2102

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.