VM65454: HYPERSWAP MAY TIMEOUT IF A SENSE I/O EXISTS ON DASD

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• During a system Hyperswap, active I/O was discovered on a
  DASD during the SWAP phase.  It was a SENSE I/O issued by
  our first level interrupt handler because of an unsolicited
  unit check for a Summary UC.  The process is to clear any active
  I/O during the SWAP phase and then requeue it.  The problem
  is is that when the interrupt comes back for the clear on
  the system sense we dispose of it.  We don't return to HCPIOJ
  to complete the SWAP and the process times out.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All z/VM Hyperswap Command Users             *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  Timeout occurs in Hyperswap SWAP processing when active I/O
  is detected during SWAP processing.  The I/O is a system sense
  CCW issued on behalf of an unsolicited summary unit check.
  When we detect active I/O in SWAP processing a CSCH will be
  issued.  When the interrupt is presented with clear status
  we dispose of it and do not return to HCPIOJ to finish
  SWAP processing.  This causes the Hyperswap in progress to fail.
  

Problem conclusion

• HCPIOJ will be updated to check if the active I/O detected on
  the device is a system sense CCW.  If it is, it will bypass
  the CSCH.
  

Temporary fix

• FOR RELEASE VM/ESA CP/ESA R540 :
  PREREQ: NONE
  CO-REQ: NONE
  IF-REQ: NONE
  FOR RELEASE VM/ESA CP/ESA R620 :
  PREREQ: NONE
  CO-REQ: NONE
  IF-REQ: NONE
  FOR RELEASE VM/ESA CP/ESA R630 :
  PREREQ: NONE
  CO-REQ: NONE
  IF-REQ: NONE
  

Comments

APAR Information

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

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

  UM34201 UM34202 UM34203

Modules/Macros

• HCPIOJ
  

Fix information

• Fixed component name

  VM CP

• Fixed component ID

  568411202

Applicable component levels

• R540 PSY UM34201

     UP14/12/03 P 1401

• R620 PSY UM34202

     UP14/09/10 P 1401

• R630 PSY UM34203

     UP15/02/16 P 1501

Fix is available

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