Skip Robinson wrote:
[...]
An interesting question is the degree, if any, to which all defined LPARs
whether activated or not actually consume HSA storage. That is, if you
have one or five or ten LPARs defined, will HSA as some point increase
simply by virtue of those LPARs' existence regardless of whether they are
ever activated? If they do, then it would be accurate at some level to
accuse them of tying up memory. But I can guarantee that--to the byte--an
LPAR takes no storage whatever after POR if and until it's activated.
It is IMHO irrelevant on z/990 and next machines.
I did some tests on z9:
Defined and activated configuration with 20+ LPARs, 4 CSS'es, all the
CSSes were fully-sized (max. number of devices was set to maximum).
Then defined "small" config - few LPARs, single CSS, cut to 12000 devices.
I don't remember exact numbers, but HSA size changed by small degree,
maybe 20%. Just irrelevant change - that's what I learned. It is not
worth to consider HSA consupmtion when adding LPARs or subsystems.
BTW: HSA size in z9 is less than 2GB. In z/990 it was approx. 1GB.
--
Radoslaw Skorupka
Lodz, Poland
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