HPVM 4.20.05: hpvmstatus -s

[RafS]

Hi all,
I've a HP VM Host with 128GB memory and two VMs configured with Dynamic memory maximum: 8 GB and Dynamic memory target: 6 GB.
Using the example showed in "Installation and Configuration Guide", the memory requirements would be calculated as follows:
� 12.1 GB for the VM Host (1250 MB plus 8.5% of 128 GB)
� 6.64 GB VM1 requirement (6 GB + 8% of 8 GB)
� 6.64 GB VM2 requirement (6 GB + 8% of 8 GB)
� Total requirements = 25.38 GB of memory
This should leaves 128GB - 25.38GB = 102.6 GB = 105062.4 MB of memory for additional guests.
While if I use hpvmstatus -s I get:
...
Available memory = 100572 Mbytes
...

Why the results are different ?
What I wrong ?


Thanks a lot.

Regards
Raffaele

[Manix]

>>Total requirements = 25.38 GB of memory

I think this is minimum memory needed to create
HPVM host & the guests ,when they are up with some processes they may need more ,are you running any thing on top of them.

Thanks
Manix

[Eric SAUBIGNAC]

Bonsoir,

Where did you got that the additional 8% (or between 8% and 8.3% in your case) of guest memory is computed with the target memory ?

Really I don't know how this is really done, but if I do the same compute, but with 8.64 GB for the VM requirements instead of 6.64 GB, I find that you should have 100986 MB available for additionnal guests.

What happens if you lower the target memory : does it also let more memory available ?

Eric

[Anonymous]

Pls see "System Sizing Guidelines ..." whitepaper at www.hp.com/go/hpux-hpvm-docs.
It lists some kernel tunable adjustments that make HPVM host OS memory footprint smaller and less dynamic.

[RafS]

Hi all,
thanks for your precious help.

"I think this is minimum memory needed to create HPVM host & the guests ,when they are up with some processes they may need more ,are you running any thing on top of them."

I don't run anything on the VMs, furthermore I tried to run several processes and the "hpvmstatus -s" showed the same result.

"Where did you got that the additional 8% (or between 8% and 8.3% in your case) of guest memory is computed with the target memory ?"
I didn't read this anywhere, but I think it's correct.

"What happens if you lower the target memory : does it also let more memory available ?"
If I change the target memory, "hpvmstatus -s" shows a different Available Memory.

I would find a reliable formula because I need to plan several scenarios, and I can't test all of these.

I'll read the whitepaper and I hope I'll find what I need.

Thanks again
Raffaele

[RafS]

Hi all,

I've readed the white paper.
It's very interesting, but the formula used for calculate memory requirements is the same of the formula showed in the Guide.

Regards
Raffaele