Re: Sizing CF Structures
Thanks for the advice on Sizer utility. In our present case, however, new and old CECs will not be connected at the same time. An installation decision made some time ago. We are able to run our sandbox sysplex ahead of time on the new CECs but without concurrent connection on the old CECs. So far no structure has emerged as under-sized on the new hardware, but it's only a sandbox. . . J.O.Skip Robinson Southern California Edison Company Electric Dragon Team Paddler SHARE MVS Program Co-Manager 323-715-0595 Mobile 626-543-6132 Office ⇐=== NEW robin...@sce.com -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Bill Neiman Sent: Monday, October 29, 2018 5:08 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: (External):Re: Sizing CF Structures As Peter points out, the Sizer utility, rather than CFSizer, is the tool of choice for resizing structures in anticipation of a CFLEVEL change. CFSizer (https://www-01.ibm.com/support/docview.wss?uid=isg3T1027062) is appropriate when you're introducing a new workload or changing a workload for an existing structure-exploiting application. Sizer (downloaded from the CFSizer alternate sizing techniques page https://www-01.ibm.com/support/docview.wss?uid=isg3T1025939) is what you want to use when you're upgrading a CF and you're satisfied that your existing structures are adequately sized for their current workload. The Sizer download package contains documentation describing its usage and output. Note in particular that to use Sizer there must be a point in your upgrade process when you have both up-level and down-level CFs connected to some system in the sysplex. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Sizing CF Structures
As Peter points out, the Sizer utility, rather than CFSizer, is the tool of choice for resizing structures in anticipation of a CFLEVEL change. CFSizer (https://www-01.ibm.com/support/docview.wss?uid=isg3T1027062) is appropriate when you're introducing a new workload or changing a workload for an existing structure-exploiting application. Sizer (downloaded from the CFSizer alternate sizing techniques page https://www-01.ibm.com/support/docview.wss?uid=isg3T1025939) is what you want to use when you're upgrading a CF and you're satisfied that your existing structures are adequately sized for their current workload. The Sizer download package contains documentation describing its usage and output. Note in particular that to use Sizer there must be a point in your upgrade process when you have both up-level and down-level CFs connected to some system in the sysplex. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Sizing CF Structures
I break it into two parts: hardware-motivated size changes and software-motivated ones. Normally the latter are fairly predictable, e.g. based on usage, etc. Here you say there is no indication of any change there. The former are somewhat sparsely documented in my view, but there is usually mention in the PR/SM guide and the various redbooks (Tech Guide, Tech Intro, etc.) of what a new level of CFCC will mean for the CF structure sizes. The z14 Tech Intro says this in section 3.7.6: Coupling Facility Control Code Level Various levels (such as 22 and 23) of Coupling Facility Control Code (CFCC) are available for the z14. For more information, see IBM Knowledge Center. CF structure size changes can be expected when moving from one CFCC level to another. Review the CF LPAR size by using the following tools: The CFSizer tool is a web-based and is useful when a workload is changed or introduced The Sizer Utility, which is an authorized z/OS program download, is useful when upgrading a CF Have you tried the Sizer Utility? I don't have a system to use it on just now but it may be worth a shot. I also found that the CFSizer tool can be a lot of work to use and would avoid it if possible :-) A ROT: aside from your usual best-practice monitoring of changes due to usage, only change the size if the CFCC code needs it. After using CFSizer and the various inputs it needed for the different structures, I seem to recall having to approximately double the GRS structure sizes when we went to z13 and level 21, and that that ended up being overkill although we left them in place as they weren't impacting anything. DB2 structures and others (RACF, VSAM RLS, etc.) were unchanged. I didn't know about the Sizer Utility then, it may have saved us the hassle of making the GRS changes. These days with "cheap" memory it can pay to oversize the CF LPARs for safety's sake. Also, if you have a sysprog-only Sysplex, which I assume you do as that is also best practice, then one can consider resizing CFs with new LPAR definitions, structure moves, etc. if it is worth doing so after the initial migration is bedded in. I tend to take a cautious approach to CF operation, as I believe you do going by your previous posts. cheers, Peter On Thu, 25 Oct 2018 22:46:13 +, Jesse 1 Robinson wrote: >We've played the game of sizing CF structures for two decades. About to play >it yet again. The main problem is that the sizing tool asks for some input for >most structures, and that input is itself a SWAG. Without spending an >inordinate amount of time researching the current environment, does anyone >have a ROT for estimating structure sizes for a new CEC? Most structures are >probably OK-they usually are-but some may need to increase, an exigency that >often does not become apparent until a system gets busy on a Tuesday morning. > >We're moving from two z12 CECs to a z14 and a z13s with no sizing problems >currently in evidence. Any advice? > > >. >. >J.O.Skip Robinson >Southern California Edison Company >Electric Dragon Team Paddler >SHARE MVS Program Co-Manager >323-715-0595 Mobile >626-543-6132 Office <= NEW >robin...@sce.com<mailto:robin...@sce.com> > > >-- >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
Re: Sizing CF Structures
When we went to a z14-ZR1 we had to increase the size of one of our RRS structures. RRS wouldn’t come up since the min size changed with the new CFCC level. Had to have 3M instead of 2M. Don’t remember which one off the top of my head. I can check if you like. On Thu, Oct 25, 2018 at 5:46 PM Jesse 1 Robinson wrote: > We've played the game of sizing CF structures for two decades. About to > play it yet again. The main problem is that the sizing tool asks for some > input for most structures, and that input is itself a SWAG. Without > spending an inordinate amount of time researching the current environment, > does anyone have a ROT for estimating structure sizes for a new CEC? Most > structures are probably OK-they usually are-but some may need to increase, > an exigency that often does not become apparent until a system gets busy on > a Tuesday morning. > > We're moving from two z12 CECs to a z14 and a z13s with no sizing problems > currently in evidence. Any advice? > > > . > . > J.O.Skip Robinson > Southern California Edison Company > Electric Dragon Team Paddler > SHARE MVS Program Co-Manager > 323-715-0595 Mobile > 626-543-6132 Office <= NEW > robin...@sce.com<mailto:robin...@sce.com> > > > -- > 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
Sizing CF Structures
We've played the game of sizing CF structures for two decades. About to play it yet again. The main problem is that the sizing tool asks for some input for most structures, and that input is itself a SWAG. Without spending an inordinate amount of time researching the current environment, does anyone have a ROT for estimating structure sizes for a new CEC? Most structures are probably OK-they usually are-but some may need to increase, an exigency that often does not become apparent until a system gets busy on a Tuesday morning. We're moving from two z12 CECs to a z14 and a z13s with no sizing problems currently in evidence. Any advice? . . J.O.Skip Robinson Southern California Edison Company Electric Dragon Team Paddler SHARE MVS Program Co-Manager 323-715-0595 Mobile 626-543-6132 Office <= NEW robin...@sce.com<mailto:robin...@sce.com> -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
