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Re: [Xen-users] tap:aio
- To: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
- From: "Grant McWilliams" <grantmasterflash@xxxxxxxxx>
- Date: Wed, 31 Dec 2008 01:53:30 -0800
- Cc: xen-users@xxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 31 Dec 2008 01:54:10 -0800
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On Tue, Dec 30, 2008 at 11:30 PM, James Harper <james.harper@xxxxxxxxxxxxxxxx> wrote:
>
> Found the problem - blktapctrl wasn't running. I assume it didn't
start
> because the module wasn't loaded when xend was started.
>
> It appears to be all working now. A message in the logs like
"blktapctrl
> isn't running" would have been really useful :)
>
Btw, it is better to use tap:aio or phy where the underlying device is a
LVM logical volume?
Thanks
James
Was that a question? :-) Use phy for LVM logical volumes and tap:aio if it's a file on ANY partition (LV or otherwise). I've done speed tests with both LVs and diskfiles and the LVs are faster but they don't trounce the tap:aio disk file like you'd think. In several tests the file was equal to the LVM volume.
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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