No, AFAIK it doesn't work as you described.
Note: there are two things: CPU weight and memory.
CPU LPAR weight is really "adjusted" somehow, especially for low values
specified by the user.
However memory is different animal. Here you have explicitly showed
memory increments which depend on total (LPAR) memory. However the
values are reasonably low to specify single-GB regions for LPAR and the
values are honored. If you specify (during LPAR profile definition)
something which is not multiple of increment, you'll get explicit
warning with clear description.
How can one be sure the above is true? Math. Memory assigned to LPAR is
also reported by z/OS with no "stolen chunks". Sum of LPAR memory
regions give total memory available for user. HSA is fixed and not
counted as user memory.
Regarding reason for using z/OS in low memory LPAR:
1. It works, especially with no workload (think sandbox, simple test, etc.)
2. If you are short on memory, you can assign more to prod LPAR. From
the other hand it should be analyzed whether adding 4 or 5 Gigabytes to
prod will cause significant change.
Regards
--
Radoslaw Skorupka
Lodz, Poland
W dniu 2019-12-09 o 20:06, Jesse 1 Robinson pisze:
It's temping to be parsimonious and reduce storage allocation to a bare
minimum, but it can be a losing game. Regardless of how little storage you
specify in an LPAR profile, the hardware itself will adjust the 'effective
allocation' according to the CPU model. That is, the amount of storage reserved
to an LPAR will never be less than the h/w minimum. So if you specify a
fraction of the hardware increment, you will effectively lose any remaining
storage in that range. It cannot be used by any LPAR.
So you might as well as specify any storage remaining in the increment. It will
cost you nothing.
.
.
J.O.Skip Robinson
Southern California Edison Company
Electric Dragon Team Paddler
SHARE MVS Program Co-Manager
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-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of
Jousma, David
Sent: Monday, December 9, 2019 8:04 AM
To: [email protected]
Subject: (External):Re: A minimum of 8 GB of real memory is required to IPL
I'm pretty sure I've heard it mentioned that Bill Gates said "Who could ever need
more than 640K of RAM?" Haha, how times have changed.
_____________________________________________________________________________________________________
Dave Jousma
AVP | Manager, Systems Engineering
Fifth Third Bank | 1830 East Paris Ave, SE | MD RSCB2H | Grand Rapids, MI
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616.653.8429 | fax: 616.653.2717
-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of R.S.
Sent: Monday, December 9, 2019 10:47 AM
To: [email protected]
Subject: Re: A minimum of 8 GB of real memory is required to IPL
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W dniu 2019-12-09 o 15:56, Burgess, Otto A. pisze:
Good to know, thanks
Perhaps IBM is more conservative on the recommendations than they need
to be
Well, not so long ago we discussed whether 1GB is really good choice for
sandbox z/OS system. The other options were 512MB and .75GB.
Later we increased 1GB to 2GB.
Nowadays I have 16GB ...in my PC, which is old and my new PC waiting for use
have 32GB. I didn't order anything special, just regular PC.
--
Radoslaw Skorupka
Lodz, Poland
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