A fix is available
APAR status
Closed as program error.
Error description
Read-ahead improvements. * Additional keywords: QRep
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 * * Release 1. * **************************************************************** * PROBLEM DESCRIPTION: InfoSphere Data Replication, Q * * Replication slows down when MQ transmit * * queue or Q Replication apply queue * * exceed buffer pool capacity and size of * * MQ messages is greater than 30kB. * **************************************************************** * RECOMMENDATION: * **************************************************************** New read ahead function is provided to parallelize the disk read operations required to pre-stage data for large messages from the pageset into the bufferpool for MQGET operations.
Problem conclusion
Users of Q Replication can enable the large message read ahead function for the queue managers hosting Q Replication transmission and apply queues with the MQSC commands: RECOVER QMGR(TUNE READAHEAD ON) RECOVER QMGR(TUNE RAHGET ON) The function can be activated dynamically by entering at a console, or, added to the queue manager configuration by adding to a file processed in the CSQINP2 concatenation during queue manager start up. Additionally, non-serialized pageset access should be enabled by rebuilding ZPARM with an additional service switch activated and restarting queue manager. Contact IBM support for details on setting the Service parameter. 100Y CSQIDUSE CSQIMGE9 CSQIRAHP CSQIRECP CSQPMTRM CSQP1CON CSQP1DWP CSQP1INI CSQP1RAH
Temporary fix
Comments
APAR Information
APAR number
PM81785
Reported component name
WMQ Z/OS V7
Reported component ID
5655R3600
Reported release
100
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
YesSpecatt / New Function / Xsystem
Submitted date
2013-01-31
Closed date
2013-02-06
Last modified date
2013-09-25
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UK91439
Modules/Macros
CSQIDUSE CSQIMGE9 CSQIRAHP CSQIRECP CSQPMTRM CSQP1CON CSQP1DWP CSQP1INI CSQP1RAH
Fix information
Fixed component name
WMQ Z/OS V7
Fixed component ID
5655R3600
Applicable component levels
R100 PSY UK91439
UP13/02/20 P F302
Fix is available
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Document Information
Modified date:
25 September 2013