Re: [Xen-users] LVM's inside of Domu's

To:	Donny Brooks <dbrooks@xxxxxxxxxxxxxxxx>
Subject:	Re: [Xen-users] LVM's inside of Domu's
From:	Edson Marquezani Filho <edsonmarquezani@xxxxxxxxx>
Date:	Thu, 15 Apr 2010 09:04:08 -0300
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>
> Possible drawbacks to having LVM in domu:
> cannot mount /dev/foo/lv from dom0 and see filesystem
> possible slowdown?
>
> Looking for any and all feedback on this. Thanks in advance!
>

My (very short, I advise) experience on that topic was bad enough to
make me give up on using LVM over LVM. Yes, I agree that would the
ideal scenario for storage managment, but after running some basic I/O
tests (with IOZone[1]) I found out that performance went to the ground
drastically. Ok, maybe I'm being a litte dramatic here, but I really
had a significant decrease on I/O write and read rates after adding a
second LVM layer on domU. So, I abandoned this idea and kept LVM only
on dom0 side.

That's my particular point of view, but not take it as a rule. You
should perform your own tests and see what you get.

[1] http://www.iozone.org/

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Re: [Xen-users] LVM's inside of Domu's