Greg, In your opinion, would it be okay to specify a reserve value to all partition profiles that equals the highest number of CPs that my CBU records allow?
This would allow for total flexibility of CP assignment to any or all lpars. In my case, it would also apply to a second set of backup partitions on an opposing CPC for data center failover capability. Bob -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Greg Dyck Sent: Thursday, May 12, 2016 1:42 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Dynamic CPU ADD to a z/OS lpar On 5/12/2016 10:17 AM, Mark Zelden wrote: > On Thu, 12 May 2016 07:30:03 -0400, Richards, Robert B. > <robert.richa...@opm.gov> wrote: > >> I do have a follow-up question.... Is anyone aware of a downside to over >> specifying reserved CPs? > > LCCA/PCCA storage. But the default CBLOC has been VIRTUAL31 since z/OS > 1.12. Even > if you are still overriding it to below the line it shouldn't be a > problem unless you are reserving a large number (FSVO large) and have 24-bit > issues already in your common / pvt storage. Not true. LCCA/PCCA storage is only allocated for a CP when a CP is logically online. The maximum number of CPs is dependent on the value of CVTMAXMP that is set when z/OS IPL's. This value effects the size of many other control blocks, including, but not limited to, the LCCAVT and the PCCAVT. Which is why CVTMAXMP can not be increased dynamically. While over specifying reserved CPs does have an impact on storage usage, it is a *minor* impact until the CPs are actually brought online to z/OS. So don't worry about over specifying the value. Greg ---------------------------------------------------------------------- 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
