VM66431: IMPROVE I/O TIME FOR DUMP PROCESSING

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• This Apar exploits DASD zHPF I/O, when available, when
  writing CP Hard Abend and Snap Dumps to CP Dump / Spool space.
  
  The goal is to reduce the amount of time a system is unavailable
  while a dump is being taken, before the system is re-IPLed.
  This will shorten unplanned outages on systems with large
  amounts of real memory.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of the z/VM CP dump function       *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  With this Apar, z/VM exploits IBM Z High Performance Ficon I/O
  technology (zHPF), when available, during the process of
  writing CP hard abend and snap dumps to CP dump/spool space.
  

Problem conclusion

Temporary fix

• FOR RELEASE VM/ESA CP/ESA R720 :
  PREREQ: VM66439
  CO-REQ: NONE
  IF-REQ: NONE
  

Comments

• With this Apar, z/VM exploits IBM Z High Performance Ficon I/O
  technology (zHPF), when available, during the process of writing
  CP hard abend and snap dumps to CP dump/spool space.  This
  reduces the amount of time a system is unavailable while a dump
  is being taken, before the system is re-IPLed.  It shortens
  unplanned outages on systems with large amounts of real memory.
  For snap dumps, it shortens the planned outage to take a dump.
  This enhancement has potential to reduce elapsed dump time by
  about 50%.  Customers' actual results will depend upon their
  workloads and configurations.
  

APAR Information

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

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

  UM35822

Modules/Macros

• CPLOAD   HCPDIO   HCPDMP   HCPDMQ   HCPDTX   HCPMDLAT
  

Fix information

• Fixed component name

  VM CP

• Fixed component ID

  568411202

Applicable component levels

• R720 PSY UM35822

     UP21/02/23 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.