Long ago (2005) we had one of the largest generators of SMF data on
record and continued to use MAN datasets using a couple of techniques
to carry the load.
Environment: four CECS, all in the same SYSPLEX. four on UK time,
ten on US time. Extensive use of CICSPLEX and transaction routine
with DB2 data sharing.
Techniques:
* multiple MAN data sets for each system all in shared user
catalogs after system initialization. IPLed on master cataloged MAN
files, then switched over to the user cataloged ones late in the
start up process.)
* dump/clear routines designed so that multiple instances could
run on a system at the same time. GDGs were not used to avoid base
contention. Dataset names generated by dynamic system variables.
* Dump phases were scheduled on small utility LPARS, with clear
phases run on the originating image.
* offloaded data was SMS tailored compressed (today would use
zEDC) getting close to 90% compression/
* Did not use internal compression for CICS or DB2 data to lower
processor utilization in those address spaces. (these use CSRCESRV
which uses the generic compression algorithms getting 40-50%
compression and ran on GP engines). SMS compression also
super-blocks (full track read/writes) for better disk
utilization. Multi-stripping also used to speed up and overlap
phisical I/O to the files.
Michael
At 02:45 PM 8/2/2022, Radoslaw Skorupka wrote:
Content-Transfer-Encoding: 8bit
W dniu 02.08.2022 o 19:41, Steve Beaver pisze:
Has anyone ever created a LOGSTREAM on an M54 of 65000 cylinders.
I have a very, very busy CICS and DB2 on the same LPAR
No, never, even close to such huge size. I'm talking about very busy
and overloaded CICS region with DB2 on same LPAR
(200M trn/day, up to 4000 trn/s).
--
Radoslaw Skorupka
Lodz, Poland
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
