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From sebastien goasguen <>
Subject Re: About server hardware
Date Mon, 09 Jul 2012 13:12:11 GMT
Hi Jewel,

I agree with Abhi, you would need to describe your use case in more details.
Specifying the amount of resources needed for each VM and the hypervisor used.

If you cannot overcommit memory and want 1GB per VM, then you need at
least 8 GB RAM plus extra for hypervisor/host kernel. If you *can*
over commit then you may choose to use less RAM on the host (<8GB ofr
1GB guests).

Same thing with the number of cores, you could have only 4 or 6 cores
but run 8 VMs.

This is really a guest VM performance issue, as well as workload
profile. Hypervisor experts should be able to help with different
scenarios and identify a rule of thumb.


On Mon, Jul 9, 2012 at 8:48 AM, Abhinandan Prateek
<> wrote:
> Hi Jewel,
>    If you list down the requirements for the guest VM in terms of CPU, RAM and storage
adding that to Xenserver overhead you can get the requirements for the hardware you need.
> For Xenserver overhead, simple rule of thumb is to allow 512 MB for the XenServer total
(Hypervisor plus the control domain) if there is less than 5 GB of memory in the server, and
allow 1 GB of memory if there>   Also you need to decide if you want HA, in that case you
will need some redundant hardware.
> -abhi
>>-----Original Message-----
>>From: Jewel Nuruddin []
>>Sent: Monday, July 09, 2012 4:27 PM
>>To:; cloudstack-
>>Subject: About server hardware
>>Hi All,
>>Need one comments about server hardware.
>>In one hypervisor I want to run 8 guest vm, what will be the main hardware I
>>have to take care properly!
>>can any one have any thought?

Sebastien Goasguen
Open Source Cloud Evangelist, Cloudstack

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