RE: PowerVM overhead

I have found that there can be substantial overhead involved in moving dynamic resources, especially memory.
Because of this, I opt to run CAPPED LPARs, cpu and memory allocated.

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Mitchell, Dana
Sent: Monday, February 16, 2015 10:31 AM
To: Midrange Systems Technical Discussion
Subject: PowerVM overhead

Is there measureable overhead assoiciated with PowerVM hypervisor having to frequently allow an LPAR to exceed its CPU allotment and draw from unused capacity in the shared CPU pool? We have an 8202-E4D with 2 LPARs. One is allocated 0.75 of a core, the other is 0.25 with 2 reserved, the Shared pool contains 3 cores. The larger of the two lpars pretty much runs over .75 of a core throughout prime shift. It has been proposed that we work to allocate CPU closer to the actual usage to reduce as much as possible the situation where the hypervisor has to tap into unused capacity from the reserved amount and/or the other LPAR. Does anyone have any evidence one way or the other on this quandary?

Thanks
Dana


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