W dniu 2011-07-18 14:42, Staller, Allan pisze:
<snip>
Our CPC (2094-S18-708) now has 8 Physical CP and has 1 production LPAR,
2 maintenance LPARs, 2 ICF LPARs and 2 test LPARs running at the moment.
Currently, all LPARs are equipped with shared CPs and have weight values
assigned. The details are as follows.
production LPAR 1
initial LCP 8
reserved LCP 10
weight 40
</snip>
Are you saying that all LPARs have 8 active(shared)/10 reserved LP's
assigned?
If so, this is a bad thing to do! PR/SM overhead is excessive (only the
active LP's affect the overhead).
Can you define "excessive" or simply tell us how big overhead would you
expect in such scenario?
The logical/physical ratio should (ROT) not exceed 2 to 1.
I have pushed this to 3 to 1 with some very low activity test LPARs
where performance was not critical.
Let's assume you have 15 LPARs. How would you assign CPs to those LPARs?
Is it possible to have CP shared between, let's say, 2 LPARs, but not
other 13?
As far as I know the only choice is SHARED or DEDICATED. Shared by *all*
LPARs. There is also CF CPU(n),OFFLINE...
[...]
No. IBM does not prevent you from defining more LP's than CP's. However
the overhead becomes excessive when the LP/CP ratio exceeds (2 to 3) to
1.
IBM allows to create 60 LPARs on machines with theoretical limitation 32
CPs. z/990D32.
Regards
--
Radoslaw Skorupka
Lodz, Poland
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