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

To:	Sami Dalouche <skoobi@xxxxxxx>
Subject:	Re: [Xen-users] Xen Disk I/O performance vs native performance
From:	John Madden <jmadden@xxxxxxxxxxx>
Date:	Mon, 28 Jan 2008 09:48:52 -0500
Cc:	Mitch Kelly <mitchkelly@xxxxxxxxxxxxxx>, James Harper <james.harper@xxxxxxxxxxxxxxxx>, Xen Users <xen-users@xxxxxxxxxxxxxxxxxxx>, Javier Guerra <javier@xxxxxxxxxxx>
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On Sat, 2008-01-26 at 21:08 +0100, Sami Dalouche wrote:
> Do you have anything special that would make LVM slow ?

Uh yeah, hdparm itself.

Folks, please PLEASE don't use hdparm as an i/o benchmark!  Regardless
of its other problems, LVM isn't a disk, so hdparm is useless in
measuring metrics for it.  

John



-- 
John Madden
Sr. UNIX Systems Engineer
Ivy Tech Community College of Indiana
jmadden@xxxxxxxxxxx


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