OA58406: IOS071I START PENDINGS FOLLOWING HARDWARE FAILURE RESULTING IN CONTENTION ON VARYDEV AND LPEP RESOURCES

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Following a hardware failure, IOS attempts to perform a sense ID
  I/O as part of channel path recovery.  This I/O may continously
  receive start pendings, preventing other I/Os from being started
  to the device. This may result in contention for the LPEP and
  VARYDEV resources.
  
  ANALYSIS:
  Daughter tasks hang in IECVDPTH waiting for I/O to complete for
  a SENSE ID ccw.
  

Local fix

• 1) Check syslog for repeated - repetative
     IOS071I Start Pending messages , ie.
     IEF196I IOS071I 7584,**,*MASTER*, START PENDING
     IOS071I 7584,**,*MASTER*, START PENDING 439
  2) Vary these devices OFFLINE FORCE, ie.
     VARY xxxx,OFFLINE,FORCE
   --------------OR----------------------------------
  1) Use the D GRS,C command to display the owner TCB for SYSIEFSD
     VARYDEV resource owner.  TCB:006FC920, Jobname IOSAS.
  2) Use the Force TCB command:
  FORCE IOSAS,TCB=6FC920
  NOTE: only use 6 digits for the TCB address leading 00.. are not
  used.
  If more than one VARY was issued this command may be necessary
  for each TCB involved in the VARY
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Users at HBB77A0 and above                                   *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * As a result of a hardware failure,                           *
  * continual start pending conditions                           *
  * (MSGIOS071I) may occur on                                    *
  * self-description I/O started as part                         *
  * of channel path recovery.  Additionally                      *
  * contention on resources such as                              *
  * SYSIEFSD.VARYDEV and SYSZIOS.LPEP may                        *
  * occur.                                                       *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  As a result of a hardware failure, continual start pending
  conditions (MSGIOS071I) may occur on self-description I/O
  started as part of channel path recovery.  Additionally
  contention on resources such as SYSIEFSD.VARYDEV and
  SYSZIOS.LPEP may occur.
  

Problem conclusion

• Change self description processing for active recovery I/O
  to reduce the MIH time and not retry for a start pending
  condition.
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

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

  UJ02092 UJ02093 UJ02094

Modules/Macros

• IOSVSLFD
  

Fix information

• Fixed component name

  IOS

• Fixed component ID

  5752SC1C3

Applicable component levels

• R7A0 PSY UJ02094

     UP20/02/26 P F002 ¢

• R7B0 PSY UJ02092

     UP20/02/26 P F002 ¢

• R7C0 PSY UJ02093

     UP20/02/26 P F002 ¢

Fix is available

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