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Logical Processors

 
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vasanthz

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Joined: 28 Aug 2007
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PostPosted: Mon Sep 08, 2014 11:49 pm    Post subject: Logical Processors
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Hi,

Suppose there are 6 physical processors in a machine with 2 lpars.
1 lpar is configured with 3 logical processors & other with 5 Logical processors.

Does this mean that only 5 physical engines on the machine will be used at all times with this configuration?

Thanks & Regards,
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vasanthz

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PostPosted: Wed Sep 10, 2014 7:55 pm    Post subject:
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I'll bump my thread a little with some additional information.

the reason I have this doubt is, we have a box with 5 engines, OOCOD record was added into our machine & additional engine was added. The box has 6 engines now, but the lpars in the machine are configured only with maximum of 5 logical processors.

Hence the doubt. I am suspecting that the additional processor is not being used currently, but when the load increases a logical processor would be added to one of the lpars to make use of the physical engine.
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nevilh

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PostPosted: Fri Sep 12, 2014 2:39 pm    Post subject: Reply to: Logical Processors
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Have you tried issueing command D M=CPU to see what cpu's are online
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Rohit Umarjikar

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PostPosted: Fri Sep 12, 2014 9:01 pm    Post subject:
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Vasanth,
I don't more than you on this but thought to check on this.

I guess, zIIP and zAAP does not need any manual lookup to do a switch or load balancing.

Btw do you know the threashold when would get the 6th engine be in effect unless or otherwise reached , it wouldn't be in effect.
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vasanthz

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PostPosted: Wed Sep 24, 2014 6:03 pm    Post subject:
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Hello,
Sorry to be rude, not replying to this topic for a while. I was on a peacful holiday.

Nevilh, as you suggested I issued the D M=CPU command and below is the output. It shows 5 CPU online and they have changed the logical processor count to 5 for an lpar. I realize that I don't fully understand the concept yet & have a lto of reading to do in this area.

Code:
IEE174I 08.16.15 DISPLAY M 521
PROCESSOR STATUS
ID  CPU                 
00  +                     
01  +                     
02  +                     
03  +                     
04  +                   
05  +                   
06  +I                   
07  +I                 
08  N


Quote:
Btw do you know the threashold when would get the 6th engine be in effect unless or otherwise reached , it wouldn't be in effect.

Rohit, I think the additional processor is added manually, when there is a need via HMC and not based on a threshold limit. I am open to correction.

Thanks & Regards
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