topic Re: hpvmcreate in Operating System - HP-UX

hpvmcreate

Slawek Ksiazek — Tue, 13 May 2008 09:26:26 GMT

Hi
I have question if is possible create intgrity virtual machine with 1,5vCPU?

for example:
hpvmcreate -c 1.5?

Thanks for info

Slawek

Re: hpvmcreate

Zeev Schultz — Tue, 13 May 2008 09:51:49 GMT

Not that I'm aware of. You can assign from 1 to 4 vCPUs to guest. However you can play with "-e" or "-E" flags to set % of cpu power assigned to the guest. For example,you can assign 2 vCPUs to your guest with -c 2 and reach 1.5 with -e 75 which means guest will use 75% of each vCPU making a total of 150 from 200% available.

Note,however,that all physical cpus and accordingly vCPUs are shared among all guests so what really provides cpu time is "-e"/"-E" since with -c only you'll get 10% of these cpus.

Zeev

Re: hpvmcreate

melvyn burnard — Tue, 13 May 2008 15:06:48 GMT

No, you have to specify vCPU's in Integers, not fractions.

You can then play with the entitlement settings

Re: hpvmcreate

Eric SAUBIGNAC — Wed, 21 May 2008 08:52:00 GMT

Bonjour,

As previously said, you must have an integer number of vCPU in a VM. You can play with entitlement, but you will never have a fixed amount of 1.5 CPU with native features of HPVM.

But you can have a fraction of CPU allocated to a VM, for example 1.5, with the product gWLM (Global WorkLoad Manager) trough "fixed allocation policy". With gWLM you have more ways to control how CPU is used by the VMs : fixed, utilization, own-borrow and custom policies.

The problem with "fixed policiy" is that you loose dynamic allocation provided by HPVM. In fact you give a constant share of CPU resource to a VM, even if it does not need it at a time. "fixed policy" may result in a lower system utilization because resources that are not in use are not allowed to be shared.

gWLM is a product you must purchase. For more informations, look at : http://docs.hp.com/en/vse.html#HP%20Global%20Workload%20Manager

Regards

Eric