George, I had a similar performance problem when I converted reserves on a busy RACF primary a few years ago. Never got to the bottom of why CICS trx were driving it so hard, but the hardware reserve was much faster than then GRS ring in a 2xOS390 GRS ring.
Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > Behalf Of George Kozakos > Sent: Thursday, 11 May 2006 5:50 PM > To: [email protected] > Subject: Converting hardware reserves for ACF2 databases > > I am working with a customer implementing GDPS HyperSwap. On of the > requirements is to convert all hardware reserves to global enqueues. We > are > having performance problems with the ACF2 LOGONIDS database after > converting the reserves. In particular, there is queueing by APPC on > SYSVSAM/LOGONIDS mainly for exclusive access. This is impacting online > banking applications. > > We are wondering if anyone has converted the ACF2 database reserves and > how > they had eliminated performance problems. Currently we are looking to > implement the SYSPLEX support of putting the LOGONIDS database in a CF > structure to eliminate I/Os for reads. We are also planning to specify the > ALREADYV option for ACF2 access via APPC. We have implemented the NO-STATS > privilege and have installed QO74694. Any other suggestions would be > welcome. > > Regards, > George Kozakos > > ---------------------------------------------------------------------- > 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 ---------------------------------------------------------------------- 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
