IMHO the key to running system efficiently is to assure enough physical
memory.
Enough mean paging rate close to zero during normal operation.
<My humble assumptions>
Paging is still good, but only clean out inactive pages (looong time).
However DAT is in use even with no paging - just to translate virtual
storage to real storage.
</>
--
Radoslaw Skorupka
Lodz, Poland
W dniu 26.08.2020 o 18:04, Mike Schwab pisze:
The key to running MVS efficiently under VM was to specify a small
region for MVS within VM. This would result with all the VM pages for
MVS being in and MVS would page in and out. A large region for MVS
would result in MVS and VM both paging in and out, working against
each other. So look at Linux memory utilization and trim the memory
to just above the actual utilization. I'm guessing 10% over
utilization but experiment with the amount and monitor paging I/O. If
no paging I/O trim a little, then once you start to get paging go up a
little bit until it stops.
On Wed, Aug 26, 2020 at 10:54 AM Mauri Kanter <itzuv...@013.net.il> wrote:
Hi:
BTW, speaking of running zCX under z/OS under z/VM ...
Does anyone know whether (or not) the DAT translation is kept in the TLBs (CAM
memory)?
I don't know why, but I think there was a limit on the levels of
hardware-assisted DAT translation ...
I want to know whether running zCX on a z/OS under z/VM is efficient
hardware-wise ...
Mauri
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