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Resource allocation

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Resource allocation - 5.Jun.2008 8:42:54 AM   
wimp

 

Posts: 1
Joined: 5.Jun.2008
Status: offline
Hi,

a question on assigning resources for a VM:


If I have an infrastructure of at least 2 ESX(i) 3.5 servers and a shared storage environment, should the physical machines be as powerfull as the 'biggest' virtual server?

An example:
Virtual server V1 runs on physical server P1 but needs a lot more CPU. Can I just add an extra physical server to the Vmware infrastructure and allocate more CPU to V1?
In other words: do the virtualized servers only see the whole pool of resources, and can they be allocated regardless the physical servers. Or must the allocated resources to one virtual machine always fit within the physical resources of one server in the Vmware infrastructure?

Thanks,
Wim
Post #: 1
RE: Resource allocation - 6.Jun.2008 1:24:52 AM   
hhandersson

 

Posts: 1
Joined: 6.Jun.2008
Status: offline
Hi,

your virtual machine can only have as much cpu as one server has. If you have a physical server with lets say 2 Dual Core CPU's and you specifiy the VM to have 4 vCPU's then the VM would use all Cores from the physical machine. 4 vCPU's are the maximum.

(in reply to wimp)
Post #: 2
RE: Resource allocation - 6.Jun.2008 3:35:49 AM   
mkguy

 

Posts: 2
Joined: 3.Jun.2008
Status: offline
It is as hhandersson said. A VM can only be run on a single ESX Host at the same time. This VM can only utilize the resources of that particular host with a maximum of 4 vCPUs that must be scheduled on 4 individual cores/threads/H.E.C.'s of that particular host.

The DRS cluster feature only balances (live migrates) multiple VMs as a whole from ESX to ESX within a cluster of hosts.
For example, host A's VMs are idle and host B has two VMs that start to eat up CPU resources. Depending on your configuration, the VC will either make a recommendation or automatically migrate one of the VMs to host A using VMotion, in order to provide both VMs with the best resources of  the hosts in that cluster.

See VMwares Resource Management Guide for more details on that topic.
 
http://vmware.com/pdf/vi3_35/esx_3/r35/vi3_35_25_resource_mgmt.pdf

(in reply to hhandersson)
Post #: 3

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