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Max no of LPAR in 595

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  #1  
Old January 29th, 2008
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Max no of LPAR in 595
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Dear Friends,

As per the Micro partition u can use 1/10 of processor. so fully populated p595 is having 64 proc..so u can have max 640 LPAR..but as per the IBM docs max no of LPAR is 254 only...

why this limitation..
is it limitation of pSeries/hypervisor?
is it limitation of HMC?

Ritesh
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Old January 29th, 2008
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Re: Max no of LPAR in 595
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The maximum number of LPARs is 10XCPU or 2XMEM (in GB), whichever is smaller. Remember to account for the loss of memory set aside for the hypervisor.
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Old January 29th, 2008
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Re: Max no of LPAR in 595
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HI..

If i have p595 with 64 CPU and 256 GB Mem..then what will be max no of LPAR..

Ritesh
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Old January 29th, 2008
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Re: Max no of LPAR in 595
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512 :-) theorically... If Admin is right... ;-)
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Old January 29th, 2008
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Re: Max no of LPAR in 595
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A little less since there will be some memory allocated to the hypervisor.
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Old January 30th, 2008
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Re: Max no of LPAR in 595
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Hi...

But as per the p595 manual it is max no of lpar r 254..irrespective of mem..

why it is so???

Ritesh
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Old January 31st, 2008
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Re: Max no of LPAR in 595
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maybe to buy a new frame? :-p big blue style... lol
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Old January 31st, 2008
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Re: Max no of LPAR in 595
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The 254 LPAR limitation applies to all servers, not just the p595s. The limiting factor is the HMC, or rather the 32-bit linux kernel.
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Old January 31st, 2008
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Re: Max no of LPAR in 595
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Actually, 254 is not the maximum number of partitions for all eSeries servers...

By the book:
- p510 and p520 could have until 20 micropartitions (because they are 2-way)...
- p550 could has until 40 micropartitions (it could be 2 or 4-way)...
- p570 could has until 160 micropartitions (it could be 2 to 16-way)...
- p590 and p595 could have until 254 micropartitions (but p590 is up to 32-way and p595 is up to 64-way)...

I really do not think it is related to kernel limitations on Linux/HMC... But I can not explain why it happens (anyway, who will really need a squadrow server with more than 254 partitions? :S)

By the way, using p590/p595 with POWER6 processors and AIX 6.1, until 1024 partitions could really be created using Application Mobility feature...

More detailed information on: http://www2.hursley.ibm.com/decimal/...p-McCredie.pdf

Regards,
Luciano Martins.
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Old February 4th, 2008
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Re: Max no of LPAR in 595
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My guess would be someone architeched the LPAR ID as a single byte identifier.

"254 lpars ought to be enough for anyone..."
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