Re: [Xen-users] streaming server on a virtual machine.

To:	Brian Krusic <brian@xxxxxxxxxx>
Subject:	Re: [Xen-users] streaming server on a virtual machine.
From:	Grant McWilliams <grantmasterflash@xxxxxxxxx>
Date:	Sun, 27 Sep 2009 16:55:04 -0700
Cc:	Jeff Sturm <jeff.sturm@xxxxxxxxxx>, xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>, Mauro <mrsanna1@xxxxxxxxx>
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On Sun, Sep 27, 2009 at 2:55 PM, Brian Krusic <brian@xxxxxxxxxx> wrote:

why would fewer i/o's be needed when accessing lvm vs non lvm if both underlying fs was ext3?

i'm not challenging, just asking as this could effect how i look at things, i would ofcourse verify this as well.

you have the awsome advantage of testing intricate setups which is valuable.

- Brian

Brian,

I'll tell you my theory and if anyone knows for sure can pipe up. If you are accessing an ext3 filesystem in a diskfile inside an ext3 filesystem on a disk the OS(s) will have more work to do than accessing an ext3 filesystem on a disk. With the LVM method you're passing through the disk (via phy:) to the VM so it's accessing it directly. I don't really think it has anything to do with LVM, that's just how I passed it to the VM.

Grant McWilliams

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Re: [Xen-users] streaming server on a virtual machine.