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vmware resource pool question

When we create vm guest, we assign  cpu, memory and disk space to our vm guest.

For an example  

CPU - 500 MHz
Memory = 1 GB

It means that vm guest will get the resource if it is available? Am I right?

IF we create create a pool and if we move into a resource pool,  it will be used when there is a resource contention?
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mokkan
Asked:
mokkan
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1 Solution
 
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
if you create Reservations for the VM of 500MHz and 1GB RAM.

THE VM IS GUARANTEED TO GET THE CPU AND MEMORY.
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mokkanAuthor Commented:
If I  understand correctly,  if I don't have in the resource  pool, it means no guarantee right?

IF the vm  in resource pool, And if  it uses only 100 MHz and 512 MB, rest of the resource will be used by other VMs ?  And only if there is a contention, it will use from the resource pool?
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jmanishbabuCommented:
This link will help you to understand resource pooling better with examples.

www.vmware.com/pdf/vsphere4/r41/vsp_41_resource_mgmt.pdfSimilar
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
That is Correct.

But using reservations guarantees resources.
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mokkanAuthor Commented:
thank you I read that, but  is this right?

IF the vm  in resource pool, And if  it uses only 100 MHz and 512 MB, rest of the resource will be used by other VMs ?  And only if there is a contention, it will use from the resource pool?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
That is correct.
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mokkanAuthor Commented:
Thank you very much Hanccoka.  I read those documents and still have few  questions. For an example if I create the vm with  512 MB and 100 MHZ cpu, it is  no guaranteed that this VM will get allocated resources.

Only we can guarantee, if we bring the VM into resource pool. Also, VM will try to get the resource from  host or cluster and if there is a contention, then it will ask resource pool to provide resource. Am I right?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Correct, unless you alter the Reservations for the VM, that guarantees resources, specified CPU and Memory.

If you create a cluster and resource pool resources will be available from the defined pool, or from the host, if no cluster.


resource pools are used to restrict resources CPU and Memory, once the resources are in use, no more can be offered. They can be created to ring fence resources and stop test VMs affecting Production Machines, as the total of Memory and CPU cannot be exceeded.
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mokkanAuthor Commented:
Thank you,  when VM boots does it  get the resource from the resource pool? from the host or cluster? And when if there is contention it ask from resource pool right?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
it gets it from the defined resource pool.

if there is no more resource in the resource pool ALL VMs will suffer.
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mokkanAuthor Commented:
I thought it won't boot up, since  it doesn't have enough resources from the pool.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
if there are No Resources left you will get an error at Power On.

depends when resources in the pool are depleted.
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mokkanAuthor Commented:
Thanks a lot. I will experiment and get back to you.

Thanks again for answering my stupid questions.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
No problems
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