On 01/29/2011 09:32 PM, Les Mikesell wrote:
> On 1/29/11 5:05 AM, carlopmart wrote:
>>>
>>> |> It is very important that the virtual machine consumes the least
>>> |> resources
>>> |> possible (host has 5GB RAM and i need to run three virtual machines
>>> |> minimum,
>>> |> including this storage server as a virtual machine).
>>> |
>>> | What's the point of adding an extra virtual layer compared to an nfs
>>> | or
>>> | iscsi share from the host (nfs if it is shared, iscsi if it is the VM
>>> | image store)? This seems like it would be more efficient if you run
>>> | exsi on the hardware with centos and the others as guests anyway.
>>> |
>>>
>>> There are some advantages that I can see in that if your hardware dies you
>>> can migrate the entire host and disks over to another VMWare hosts.
>>>
>>> If your NFS host is not H/A a loss of the host would take down the virtual
>>> machines too. Additionally, virtualization offers the ability to migrate
>>> the VM and disk to newer hardware somewhat transparently allowing you to
>>> take advantage of the latest/greatest/buggy tech.
>>>
>>> Just my 2c ;)
>>>
>>
>> Correct.
>
> But I don't see how any of those things apply here. If the host fails your
> vm's
> are going to fail in any case, and there's not much magic involved in
> exporting
> an NFS share even if you need to move it. Iscsi targets are slightly more
> complicated because it's not included in the base Centos install
Sorry Less, Iscsi target is included in CentOS 5 base repository (package
scsi-target-utils).
but you can
> find howto's to set it up. When your resources are limited it looks like a
> big
> waste to add an unnecessary virtual layer to storage. I've done it the other
> way around, though, with NFS exports from the host being mounted by the guest
> VM's.
>
This is th first step. Next step is to make physical HA infraestructure with
hypervisors.
--
CL Martinez
carlopmart {at} gmail {d0t} com
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