Ted MacNEIL wrote:
These days, I would plan for a minimum of 1GB HSA, and a minimum of 3 per LPAR.
More if it's doing real work (DB2, IMS, or CICS).
Wrong plans IMHO. HSA size strongly depends on CPC generation. Before
z/990 (that means 9672, z/900, z/800) HSA size was related to IODF size
- number of devices, number of LPARs.
On z/990 HSA size grew up significantly and took approx. 1GB.
It's not a 'wrong' plan.
It's a minimum.
Most are still on a z/990 or smaller, so it's a good starting point.
But, my point was: why worry about something as small as 128MB?
Memory is cheap, and with today's memory-intensive workloads, it's cheaper than
the paging overhead.
Agreed. However I would vote for the following rule:
- if you're on z/990 then your HSA is 1GB
- if you're on z9 then your HSA is 2GB
- if you're on z/900 or 9672 then your HSA is 256MB.
It's still *simple* starting point.
Regards
--
Radoslaw Skorupka
Lodz, Poland
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