On Wed, 6 May 2026 19:05:06 +0000, Glen Garrison <[email protected]> wrote:
>I have not specifically looked at what the general population have specified >for RSU. > But I do know that many systems out there have initial and reserved > specified and have seen where some set rsu equal to their reserved, so some > must be config'ing that offline for use by other lpars. Generally > RSU=OFFLINE. I have also seen RSU=0 with reserved defined. I always liked RSU=OFFLINE on the theory that if we needed that reserved storage for dealing with an unexpected demand for memory, then we could (in theory) take it back offline so some other LPAR could use it. However it never seemed to work out quite that simply. And that was back in the day when systems when memory sizes were generally much smaller. Today, at least on the big machines, it seems most customers are less constrained, in part because the minimum orderable config is 512GB. That's not so true on the smaller (e.g. "BC") machines where the minimum orderable memory remains stuck at 64GB and some systems that really could benefit from more memory nonetheless end up not getting it during system refreshes, presumably due to cost concerns. But possibly also because they're only considering their non-existent paging as a lack of demand for memory and not investigating how much I/O they could avoid if they had more memory. Scott Chapman ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
