-----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Tom Marchant Sent: Tuesday, June 20, 2017 12:35 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: common storage usage question
On Tue, 20 Jun 2017 14:11:39 +0000, Pommier, Rex wrote: >Hi all, > >Curiosity question. Due to some storage issues we've had recently with >old 24 bit programs, I am revisiting our common storage configuration - >CSA and SQA. Taking fragmentation into account, it appears that I'm >using about 38% of my allocated SQA and about 46% of my allocated CSA. >So I'm wondering if anybody has a good feel as to what a "good" >percentage of used versus allocated space for these areas is. >How low can I safely go in free space in these areas if we decide we >want to try to eke out an additional MB of below-the-line private? Our >current private size is 11MB. I'll turn your question around, and maybe it will help you decide. Assuming that you are not able to get below the line relief by moving UCBs or anything else, remember that you can only change CSA+SQA in increments of 1MB. If you reduce CSA+SQA by 1MB, how much room does that leave you for CSA/SQA growth? What if you reduce it by 2MB? Is that even possible? -- Tom Marchant Hi Tom, Good questions. Based on my back-of-the-napkin calculations with help from RMF PP for the past 2 months, even with accounting for the fragmentation, both CSA and SQA should be sitting around 70% used if I drop the numbers to get another MB. No way will I be able to reduce it another 2 MB. All my UCBs except my consoles and CTC are above the line. Rex The information contained in this message is confidential, protected from disclosure and may be legally privileged. If the reader of this message is not the intended recipient or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any disclosure, distribution, copying, or any action taken or action omitted in reliance on it, is strictly prohibited and may be unlawful. If you have received this communication in error, please notify us immediately by replying to this message and destroy the material in its entirety, whether in electronic or hard copy format. Thank you. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
