Neither answer you show is correct.
The weights assigned to LPAR A and LPAR B represent each LPAR's share of
shared CPC capacity. With 3 shared CPs and LPAR A/B having equal weights,
your initial statement where each LPAR is entitled to 50% of 3 CPS (or 1.5
CPs each) is correct.
After having varied 2 CPs offline from LPAR A, LPAR A is still entitled to
50% of the shared CP capacity (1.5 CPs), even though it has use of only one
CP. Thus, LPAR A can use 100% of the one CP. LPAR A cannot use the
additional 50% of a CP to which it is entitled, since only one CP is
available to LPAR A.
When an LPAR is constrained in its use of the share to which it is entitled
because that share is larger than the number of CPs assigned to the LPAR,
unused share will be divided among remaining LPARs prorated based on their
entitled share. In your case of only two LPARs, LPAR B will use 100% of
the 2 CPs not used by LPAR A.
Thus the split of CPC capacity is 1/3 for LPAR A and 2/3 for LPAR B.
Regards,
Don
******
Don Deese, Computer Management Sciences, Inc.
Voice: (703) 922-7027 Fax: (703) 922-7305
http://www.cpexpert.org
******
At 10:18 AM 11/9/2005, you wrote:
The following scenario:
two LPARs on 3 CP machine, shared CPs, both LPARs are assigned weight of 50%.
Now I issued on LPAR A:
CF CPU(2),OFFLINE
and then
CF CPU(1),OFFLINE
Question:
Machine has x MIPS. What are the limits for LPAR A and LPAR B ?
1/6 of x and 5/6 of x ?
1/2 of x and 1/2 of x ?
I mean 100% workload on each system.
--
Radoslaw Skorupka
Lodz, Poland
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