VM66237: HYPERPAV ERROR RECOVERY ON PAC X'00'

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• HyperPav Alias recovery needs to change when I/O on a Alias
  devices receives Unit Check and sense indicating environmental
  data present, Format/Message x'F0' and a program action code
  of x'00'.  The I/O needs to be re-driven on the HyperPav
  Base.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All z/VM users of HyperPAV Aliases,          *
  *                 especially in GDPS environments              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  A remote flashcopy was being done on a PPRC pair of devices.
  An active I/O on an associated HyperPAV Alias devices fails
  with unit check status and sense indicating environmental data
  present, Format/Message x'F0' and a Program Action Code of
  X'00'.  This error is due to the active flashcopy on the
  secondary of the HyperPAV Base device.  CP's error recovery
  attempts retries of the I/O on the HyperPAV Primary Alias
  device until the retry count is exhausted.  The failed
  I/O causes the PPRC pair to go into suspend state because
  CP didn't retry the I/O AFTER the copy condition cleared on
  the Secondary device.
  -
  Once the failure is seen on the HyperPAV Alias device, the I/O
  should be rescheduled on the HyperPAV Base device instead
  of being retried on the HyperPAV Alias.  The retry of the
  I/O on the HyperPAV Base will cause the I/O to get queued
  and wait for the flashcopy to finish before reexecuting.
  -
  The PPRC Suspend state could cause a system outage in GDPS
  environments where a client variable is optionally set to
  reset LPARs when the PPRC pairs go into suspension state.
  

Problem conclusion

• Error recovery procedures were modified for the unit check, PAC
  x'00' error when it occurs on a HyperPAV Alias.  Instead of
  the I/O being retried on the HyperPAV Alias, it will be
  rescheduled on the associated HyperPAV Base device to be
  handled correctly.
  

Temporary fix

• FOR RELEASE VM/ESA CP/ESA R640 :
  PREREQ: VM66213
  CO-REQ: NONE
  IF-REQ: NONE
  FOR RELEASE VM/ESA CP/ESA R710 :
  PREREQ: VM66213
  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:

  UM35418 UM35419

Modules/Macros

• HCPDTE   HCPERP   HCPHPV   HCPPAV
  

Fix information

• Fixed component name

  VM CP

• Fixed component ID

  568411202

Applicable component levels

• R640 PSY UM35418

     UP19/01/09 P 1901 ¢

• R710 PSY UM35419

     UP19/01/09 P 1901 ¢

Fix is available

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