PM72512: REALLOCATE OF A DUPLEX GBP MAY GET ABEND026 RSN08118001 AND MESSAGE IXL040E IF THE GBP IS IN SHORTAGE.

A fix is available

Subscribe

You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • IXL040E CONNECTOR NAME: DB2_DAA1, JOBNAME: DAA1DBM1, ASID: 0093
    HAS NOT RESPONDED TO THE REBUILD QUIESCE EVENT.
             REBUILD PROCESSING
             FOR STRUCTURE DAA0_GBP6 CANNOT CONTINUE.
             MONITORING FOR RESPONSE STARTED: 08/12/2012 09:28:03.
             DIAG: 0000 0000 00000000
    .
    Dump Title: ABEND S026 REASON 08118001 CONNECTOR HANG
                CONNAME=DB2_DAA1 JOBNAME=DAA1DBM1
    REALLOCATE of a duplex GBP may issue above message and ABEND
    after message MSGDSNB743I if the GBP is in shortage status.
    .
    DSNB743I  -DAA1 DSNB1GBR DUPLEXING IS BEING STOPPED
               FOR GROUP BUFFER POOL GBP6
               FALLING BACK TO PRIMARY
               REASON = OPERATOR
               DB2 REASON CODE = 00000000
    .
    This may cause DB2 crash by ABENDS026 RSN08110102 if
    CFSTRHANGTIME interval is defined in the SFM policy.
    

Local fix

  • Don't issue REALLOCATE to duplex GBP while it is in shortage
    status ( message DSNB319A and DSNB325A ).
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: DB2 data sharing users.                      *
    ****************************************************************
    * PROBLEM DESCRIPTION: Various types of delays following a     *
    *                      rebuild of a group buffer pool.  This   *
    *                      can result in application hangs, lock   *
    *                      timeouts, or IXL040E messages stating   *
    *                      that DB2 is not responding to a rebuild *
    *                      event.                                  *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    At the end of a group buffer pool rebuild, DB2 goes through a
    "resume castout" process attempting to reschedule castouts that
    were interrupted by the rebuild.  There are timing windows that
    can cause this process to take longer than it should (waiting
    for castouts that started after the rebuild finished), or even
    to take forever (waiting for castout completion when no castout
    engine is actually running).  These delays can cause application
    hangs, usually waiting on a drain lock held by the pseudo-close
    process.  They can also cause subsequent GBP rebuild events to
    be ignored, resulting in IXL040E messages complaining that DB2
    is not responding.
    

Problem conclusion

  • The pageset castout logic has been modified to no longer handle
    a GBP rebuild by requeueing its request and terminating the
    engine, requiring a reschedule at the end of the rebuild.  The
    castout engine will now remain active but wait on the GBP fence
    for the rebuild to complete.  Additionally, the "resume castout"
    step at the end of the GBP rebuild has been eliminated.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM72512

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    A10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-09-10

  • Closed date

    2012-11-14

  • Last modified date

    2013-01-25

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

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

    UK83514 UK83515

Modules/Macros

  •    DSNB1GBR DSNB1PCD DSNB5PCO
    

Fix information

  • Fixed component name

    DB2 OS/390 & Z/

  • Fixed component ID

    5740XYR00

Applicable component levels

  • RA10 PSY UK83514

       UP12/11/29 P F211

  • R910 PSY UK83515

       UP12/11/29 P F211

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.



Rate this page:

(0 users)Average rating

Document information


More support for:

DB2 for z/OS

Software version:

A10

Reference #:

PM72512

Modified date:

2013-01-25

Translate my page

Machine Translation

Content navigation