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Re: [Xen-users] IO intensive guests - how to design for best performanc

To: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
Subject: Re: [Xen-users] IO intensive guests - how to design for best performance
From: Kevin Maguire <k.c.f.maguire@xxxxxxxxx>
Date: Thu, 24 Jun 2010 16:53:27 +0200
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Hi Fajar

Thanks for the reply.

On Thu, Jun 24, 2010 at 2:24 PM, Fajar A. Nugraha <fajar@xxxxxxxxx> wrote:
> On Thu, Jun 24, 2010 at 7:03 PM, Kevin Maguire <k.c.f.maguire@xxxxxxxxx> 
> wrote:
>> *) split my SAN storage into man LUNs / LVM volumes, and export 1
>> chunk per VM via phys: or tap:... interfaces
> That's raw block device, right? It would give you highest I/O. I
> highly recommend that.

Well, 2 ways occur to me

a) On the RAID units I create multiple smallish LUNs, and the
corresponding block devices (/dev/sdX) are passed to the guests

b) One large LUN on the split, split into many LVs using LVM, and
those (raw) devices passed to the guests

The latter is a bit more flexible as LVM allows growing/shrinking of
LVs easier 9and quicker) than my RAID arrays.

Note the guests needs a file-system, so inside the guests I would need
to create ext3 file-systems.


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