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Re: [Xen-users] Xen Disk I/O performance vs native performance

from [Sami Dalouche] [Permanent Link][Original]
To: Mitch Kelly <mitchkelly@xxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Xen Disk I/O performance vs native performance
From: Sami Dalouche <skoobi@xxxxxxx>
Date: Sat, 26 Jan 2008 21:08:56 +0100
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> hdparm -tT on the same lv under DomU gives me 35-50MB/sec.
> 
> So I'm getting a pretty drastic performance hit from lvm (never noticed
> that before... guess I should look into it... maybe it's an artefact of
> hdparm) and a small hit from xen blockfront/back.

I just tried a benchmark without Xen, Without RAID, on a simple HD. 

the performance (hdparm + bonnie) between LVM and native partition is
exactly the same.

Do you have anything special that would make LVM slow ?


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