John Eells wrote:
Install z/OS R8 when available and use WLM-manage inits? From the R8
preview announcement:
"JES2 will be designed to help balance workload in a multi-access
spool configuration within a sysplex by controlling the number of
WLM-managed initiators in use on each system."
(G, D, & R!)
Unlike JES3, JES2 job scheduling is not cooperative between members and
IBM has been trying to fix the resulting imbalances for a long, long
time. They hoped that WLM might provide the solution. So far, it hasn't.
When WLM-managed batch initiators first arrived in OS/390 V2R4, JES2
borrowed the JES3 concept of TLIMIT, to limit the number of jobs that
can be simultaneously active in the class at a JESplex level. (JES2
calls this XEQCOUNT.) Not good enough. Since then, they've tried to make
WLM better at balancing the sizes of the initiator pools on each system.
Still not good enough. Now, in z/OS 1.8, JES2 borrows the JES3 concept
of MLIMIT, to limit the number of jobs that can be simultaneously active
in the class at a member level. (I believe z/OS 1.8 JES2 calls this
XEQMEMBER.) Will that be good enough?
They can futz with the various limits all they want. It won't make JES2
members perform cooperative job scheduling!
--
Edward E Jaffe
Phoenix Software International, Inc
5200 W Century Blvd, Suite 800
Los Angeles, CA 90045
310-338-0400 x318
[EMAIL PROTECTED]
http://www.phoenixsoftware.com/
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
