Where are you getting the 99% number? Which version of Linux are you
running? Older versions of Linux were fooled by the CPU being taken away
and reported high values of CPU utilization in 'top' and elsewhere.
If all the numbers are from PerfKit, they don't make sense. You cannot
have 3 users running at 99% and have the 3 IFLs running at 10-15% each.
Are you sure you are looking at the same time interval? If you are lookin
g
at both Linxu and VM tools, they may not match up.
Alan Ackerman
Alan (dot) Ackerman (at) Bank of America (dot) com
On Thu, 12 Nov 2009 13:17:26 -0500, Dean, David (I/S)
<david_d...@bcbst.com> wrote:
>OK, this is for all you guys that understand the magic tunnel in which
CPU processing (usage) flows from an IFL to a zLinux server.
>
>We have a z10 running zVM 5.4 in a dedicated LPAR with 3 dedicated
IFL's. We have approximately 30 zLinux servers. Using IBM PerfKit, I
list all of the individual USER / zLinux CPU usages, each of which
generally run in the 1 to 5 % range. These servers do of course peak
higher but on average they are pretty low. We then take a look at the 3
IFL's and see usage of maybe 5% on each. Now, let's say we have a USER /
server or two or three go berserk and peak CPU at 99 % for an extended
period of time. We then look at the IFL CPU usages and all three have
climbed to maybe 10 to 15% each.
>
>How did the CPU get allocated? Is it always spread evenly across the
IFL's, is that a setting? Why, if there were 3 USER / servers running at
99%, was more CPU not allocated from the 3 IFL's? Why did the IFL's
decide to allocate X amount and go no further.
>
>In the USER DIRECTORY I allocate storage but not CPU.
>
>
>
>
>David M. Dean
>Information Systems
>BlueCross BlueShield Tennnessee
>
>
>
>
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