PM15077: IRLM ABENDU2025 IN DXRRL770

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• During Group restart, all member were coming up and some of them
  started Retained lock.New member was joying the group which was
  trigger of Max Connection rebuild. DXRRL770 incorrectly issued
  IXLLOCK request even if we already found we have an invalid RLE
  id.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All HIR2220 (irlm220) and HIR2230(irlm230)   *
  *                 users datasharing SYSPLEXDS.                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abendu2025 from DXRRL770 during a group *
  *                      restart.                                *
  ****************************************************************
  * RECOMMENDATION: INSTALL CORRECTIVE SERVICE FOR APAR/PTF      *
  ****************************************************************
  During a group restart phase DB2 was issuing RETLOCK requests
  to IRLM to create retained locks. IRLM in turn will send request
  to all members in the group to create local retained locks for
  the same resource. A lock structure rebuild happening before the
  global retain lock is processed, could create a new RLE in the
  CF. This would result in failure and abendu2025 when the DB2
  member which was restarting and had initiated the rebuild to
  increase the max users to the lock structure, processes the
  pending retain lock requests received before the rebuild and
  reacquires the retained lock during startup.
  

Problem conclusion

• GEN:
  KEYWORDS:
   SYSPLEXDS
  
  *** END IMS KEYWORDS ***
  This APAR provides a change in IRLM lock structure rebuild
  logic for increasing the number of connections dynamically. IRLM
  will not initiate a max user rebuild when the 7th or 23rd member
  joins the group. This used to be done earlier to accommodate
  additional members to join the group.  With this APAR, IRLM will
  initiate a max user rebuild only when it is needed, ie. when the
  8th or 24th member attempts to join the group and there are no
  more connections available at that time. This will avoid
  unnecessary rebuild of the lock structure which could affect CF
  storage for the lock structure.
  Rebuilding the lock structure only when it is needed will reduce
  a timing window where IRLM waits until the rebuild is done.
  Requests received during this wait may have locking information
  that may have been altered by the rebuild.
  This fix will avoid abendu2025 in DXRRL770 on IXLLOCK failure
  on the member that started the max user rebuild. The IRLM
  member is not going to an active connector and will not receive
  any global requests until the rebuild is over.
  

Temporary fix

Comments

APAR Information

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

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

  UK66258 UK66260

Modules/Macros

•    DXRRC710 DXRRC732 DXRRC752 DXRRLMCB DXRRL710
  DXRRL732 DXRRL752 DXRRS710 DXRRS732 DXRRS752
  

Fix information

• Fixed component name

  IRLM V2

• Fixed component ID

  569516401

Applicable component levels

• R220 PSY UK66258

     UP11/04/15 P F104

• R230 PSY UK66260

     UP11/04/15 P F104

Fix is available

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