On Friday 28 May 2010 10:28:53 Israel Garcia wrote:> On Fri, May 28, 2010 at 10:23 AM, Jonathan Tripathy
<jonnyt@abpni.co.uk>
wrote:> > On 28/05/10 09:01, Israel Garcia wrote:
> >> Hi guys,
> >>
> >> Do you know if I can make a raid 0 with two hdd devices on a domU?
> >>
> >> I''m running debian lenny as a dom0.
> >
> > If you''re talking about software RAID, sure you can!
> > Just use the 2 VHD''s in a software RAID style.
> >
> > But RAID0? Stay away from that :) Especially on 2 VHDs
>
> Yeap, I''m looking for better performance ..:-)
>
> regards,
> Israel.
>
Are the 2 VHDs on seperate physical disks?
If yes, why not run the RAID0 inside the DOM0 and export that as a single VHD
to the DOMU?
RAID0 won''t give you better performance if the VHDs are on the same
physical
disk.
I have no intention of testing this, but I would actually expect worse
performance if the images are not fragmented into each other in just the right
way to have each consecutively read block in sequence:
Eg. <block1 on disk1><block1 on disk2><block2 on
disk1><block2 on disk2>....
But I agree with Jonathan, RAID0 should only be used for filesystems where a
lot of temporary storage is placed. 1 disk failure of the 2 and the entire
filesystem is gone. That is not a good idea for important files.
--
Joost Roeleveld
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