Classification: Confidential 100% concur w/Martin
-----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Martin Packer Sent: Sunday, November 26, 2023 2:39 AM To: [email protected] Subject: Re: SQA overflow condition [CAUTION: This Email is from outside the Organization. Unless you trust the sender, Don’t click links or open attachments as it may be a Phishing email, which can steal your Information and compromise your Computer.] (This is not specific advice but a way of thinking about things.) SQA can, of course, overflow into CSA - with no real harm done. Unless it causes CSA to go short. (CSA can't overflow into SQA, of course.) The above statements are true for both 24-bit and 31-bit. 1409K below the line, though, is pretty extreme - for 24 bit. If you made SQA larger so that it only overflowed, say, by 100K there would be no wasted virtual storage. More importantly, check out the "free CSA" picture. You really don't want to run out of that. For 24-bit you want a few hundred K free. (But to achieve that might require losing 1MB of 24-bit private, which might not be consequence free.) For 31 bit I like to see at least 100MB free ECSA, preferably more. The reason is because ECSA is - in my experience - more volatile. Speaking of volatility, you need to plan defensively - as a problem can lead to surge in SQA and CSA usage . Final point: I would advocate using SMF 78-2 to build a picture of common storage usage - and how variable it is. Here is a blog post I wrote on the matter: htt ps://mainframeperformancetopics.com/2020/01/05/how-i-look-at-virtual-storage (Take out the space to follow the URL - as my mail client turned it into an attachment.) 😕 Cheers, Martin Sent from my iPad > On 26 Nov 2023, at 05:40, Peter <[email protected]> wrote: > > Hello > > I am able to see the below alert condition under RMF postprocessor III > > > > Name Reason Critical val. Possible cause or action > > *STOR TSQAO > 0 1409K bytes SQA overflow into CSA 1409K. > > > > > > Our SQA and CSA set up in our IEASYSxx is as below > > > > CSA=(2000,300000) > > > > SQA=(16,192) > > > Hardware: z14 > LPAR : 16gb memory > zOS 2.4 > > Do I have think about tunning the SQA parameter ? > > Regards > Peter > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send > email to [email protected] with the message: INFO IBM-MAIN Unless otherwise stated above: IBM United Kingdom Limited Registered in England and Wales with number 741598 Registered office: PO Box 41, North Harbour, Portsmouth, Hants. PO6 3AU ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ::DISCLAIMER:: ________________________________ The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents (with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates. Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the views or opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of authorized representative of HCL is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. Before opening any email and/or attachments, please check them for viruses and other defects. ________________________________ ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
