Not sure this is worth mentioning, but IBM's Health Checker has a check called IBMVLF,VLF_MAXVIRT that tells you how many times VLF has trimmed objects from various caches, depending on the parameters specified on the check. The check runs hourly by default. Of course, the check won't give you the same level of detail as a SMF analysis, but if all you are looking for is 'how big to make our memory cache to avoid thrashing/trimming', it might be a simpler thing to look at rather than extracting/analysing SMF repeatedly.
Ant. -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Steve Thompson Sent: Tuesday, 25 November 2014 1:24 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: VLF Caching On 11/24/2014 05:29 PM, Thomas Conley wrote: > On 11/24/2014 4:30 PM, Steve Thompson wrote: <SNIP> >> >> Is there a ROT for setting of the MAXVIRT for CSVLLA class? <SNIP> >> I'm thinking we should go to 64MB, but perhaps we should go higher. >> I'm just not aware of anything that gives us an idea of how much to >> set this to. <SNIP> >> Regards, >> Steve Thompson >> <SNIP> > Steve, > > I've always had to review the SMF data, then make adjustments. > No ROTs or sizing recommendations I'm aware of. > > Regards, > Tom Conley > Thanks Tom. Yeah, we are running SMF records and CP-Expert tells us, how big the Cache is, how much we've used, how often we do trim. I was just hoping someone had come up with something a little faster for this. I guess, one could set it to 512MB and then whack it down from there. I certainly hope we aren't going to be using more than that. Regards, Steve Thompson ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
