Re: z16 documentation discrepancy
Yes, CFCC is another case for discrepancies in documentation. I just pointed few of them, it wasn't complete list. And to be clear - I complaining about documentation, not limitations. I'm perfectly OK with statements like: "CF LPAR can be up to 16TB, but current CFCC will not use more than 3TB." or "General LPAR can be up to 32TB, but z/VSE will not use more than 32GB and will not work on LPAR >128GB". What I don't like is discrepancy or false information in the documentation. BTW: I don't intend to require 16TB for program RM (residency mode). :-) -- Radoslaw Skorupka Lodz, Poland W dniu 11.04.2022 o 21:25, Martin Packer pisze: I’m not sure if this is a metathread about consistency or not but let me assume not. With z/OS 2.5 you can go above 4TB – up to 16TB – but only with 2GB pages. And these aren’t your ordinary run of the mill pages. Think Db2 BPs, Java Heap, zCX. (We talked about this – Marna and I in the last episode of our podcast.) One limit you didn’t mention – but I found of interest recently – is CFCC. I’m told the limit for that is 3TB. (Customer was at 2TB and could use more – so this was not academic.) Hoping this helps. Martin Packer, Senior Performance, Capacity, Architecture Specialist IBM Technology, Worldwide +44-7802-245-584 email: martin_pac...@uk.ibm.com<mailto:martin_pac...@uk.ibm.com> Twitter / Facebook IDs: MartinPacker Blog: https://mainframeperformancetopics.com<https://mainframeperformancetopics.com/> Mainframe, Performance, Topics Podcast Series (With Marna Walle): https://anchor.fm/marna-walle<https://anchor.fm/marna-walle> Youtube channel: https://www.youtube.com/channel/UCu_65HaYgksbF6Q8SQ4oOvA<https://www.youtube.com/channel/UCu_65HaYgksbF6Q8SQ4oOvA> From: IBM Mainframe Discussion List on behalf of Radoslaw Skorupka Date: Monday, 11 April 2022 at 20:06 To: IBM-MAIN@LISTSERV.UA.EDU Subject: [EXTERNAL] z16 documentation discrepancy Actually it is not z16 specific, similar discrepancies could be observed for previous generations. I mean memory limits for given LPAR modes (General, CF, z/VM, Linux Only) and operating systems. Example: PR/SM Planning says z/OS 2.5 is limited to 4TB, while it was announced the limit was increased to 16TB. PR/SM says z/TPF is limited to 1TB, while Redbook z16 Tech. Guide says it is 4TB. According to PR/SM Planning Linux is limited to 1TB. There are cases where one can find "different versions of truth" within single book. Similiar discrepancies can be found in regard of limit of processors. Fine print note: Memory limit for LPAR in General mode is increased to 32TB which is more than z/OS can support, but this is not discrepancy, here we have two different limits. Same scenario in z15 and z/OS 2.4 - LPAR 16TB, OS 4TB. In the paragraph above I'm talking about different answers for same question. -- -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: z16 documentation discrepancy
I’m not sure if this is a metathread about consistency or not but let me assume not. With z/OS 2.5 you can go above 4TB – up to 16TB – but only with 2GB pages. And these aren’t your ordinary run of the mill pages. Think Db2 BPs, Java Heap, zCX. (We talked about this – Marna and I in the last episode of our podcast.) One limit you didn’t mention – but I found of interest recently – is CFCC. I’m told the limit for that is 3TB. (Customer was at 2TB and could use more – so this was not academic.) Hoping this helps. Martin Packer, Senior Performance, Capacity, Architecture Specialist IBM Technology, Worldwide +44-7802-245-584 email: martin_pac...@uk.ibm.com<mailto:martin_pac...@uk.ibm.com> Twitter / Facebook IDs: MartinPacker Blog: https://mainframeperformancetopics.com<https://mainframeperformancetopics.com/> Mainframe, Performance, Topics Podcast Series (With Marna Walle): https://anchor.fm/marna-walle<https://anchor.fm/marna-walle> Youtube channel: https://www.youtube.com/channel/UCu_65HaYgksbF6Q8SQ4oOvA<https://www.youtube.com/channel/UCu_65HaYgksbF6Q8SQ4oOvA> From: IBM Mainframe Discussion List on behalf of Radoslaw Skorupka Date: Monday, 11 April 2022 at 20:06 To: IBM-MAIN@LISTSERV.UA.EDU Subject: [EXTERNAL] z16 documentation discrepancy Actually it is not z16 specific, similar discrepancies could be observed for previous generations. I mean memory limits for given LPAR modes (General, CF, z/VM, Linux Only) and operating systems. Example: PR/SM Planning says z/OS 2.5 is limited to 4TB, while it was announced the limit was increased to 16TB. PR/SM says z/TPF is limited to 1TB, while Redbook z16 Tech. Guide says it is 4TB. According to PR/SM Planning Linux is limited to 1TB. There are cases where one can find "different versions of truth" within single book. Similiar discrepancies can be found in regard of limit of processors. Fine print note: Memory limit for LPAR in General mode is increased to 32TB which is more than z/OS can support, but this is not discrepancy, here we have two different limits. Same scenario in z15 and z/OS 2.4 - LPAR 16TB, OS 4TB. In the paragraph above I'm talking about different answers for same question. -- Radoslaw Skorupka Lodz, Poland -- 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
z16 documentation discrepancy
Actually it is not z16 specific, similar discrepancies could be observed for previous generations. I mean memory limits for given LPAR modes (General, CF, z/VM, Linux Only) and operating systems. Example: PR/SM Planning says z/OS 2.5 is limited to 4TB, while it was announced the limit was increased to 16TB. PR/SM says z/TPF is limited to 1TB, while Redbook z16 Tech. Guide says it is 4TB. According to PR/SM Planning Linux is limited to 1TB. There are cases where one can find "different versions of truth" within single book. Similiar discrepancies can be found in regard of limit of processors. Fine print note: Memory limit for LPAR in General mode is increased to 32TB which is more than z/OS can support, but this is not discrepancy, here we have two different limits. Same scenario in z15 and z/OS 2.4 - LPAR 16TB, OS 4TB. In the paragraph above I'm talking about different answers for same question. -- Radoslaw Skorupka Lodz, Poland -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
