Re: [Xen-users] Use image storage vs block storage

To:	Bart Coninckx <bart.coninckx@xxxxxxxxxx>
Subject:	Re: [Xen-users] Use image storage vs block storage
From:	Grant McWilliams <grantmasterflash@xxxxxxxxx>
Date:	Fri, 9 Jul 2010 07:00:36 -0700
Cc:	Bruno Steven <aspenbr@xxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
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On Thu, Jul 8, 2010 at 6:55 AM, Bart Coninckx <bart.coninckx@xxxxxxxxxx> wrote:

On Thursday 08 July 2010 15:09:39 Bruno Steven wrote:
> Hi,
>
> I have doubt about diference between use the image for storage virtual
> machine vs storage in blocks using lvm , what difference ? What have
> better performance?
>

block devices are faster. I personally don't see the added value of image
files: with "dd" you can create them anytime you wish.

B.

LVM is faster for some things and other times they are about the same. During my tests LVM at the very most outperformed disk images
by 10%. I was quite surprised that the difference wasn't more. In most tests though it's very near the same speed. However I run all
database VMs on LVM because Imysqlbench clocks the DomU at about 99% of the speed of Dom0 if the DomU is on LVM. On a disk image
it reads about 95%. This for my databases is worth the effort.

Grant McWilliams

Some people, when confronted with a problem, think "I know, I'll use Windows."
Now they have two problems.

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Re: [Xen-users] Use image storage vs block storage