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xen-users
RE: [Xen-users] how to use prebuilt images from jailtime.org?
Kai Schaetzl wrote:
> Gordon McLellan wrote on Mon, 7 Apr 2008 14:00:31 -0400:
>
> > My only drawback at this time is soft-raid doesn't handle
> > multi user IO requests very well, the disk array gets swamped pretty
> > easy when multiple VMs are trying to read/write at the same time.
>
> So, for a high I/O DomUs you wouldn't recommend it?
The soft-raid that you talk about wouldn't happen to be a
raid5 or raid6?
In my tests of running a large number of VMs on top of RAID
is that you should use RAID10 as the io appears as a lot of
extremely random io traffic as each VM grabs a little data
from here or there all the time. The random io shouldn't
be so high to require SAS unless you put a LARGE number of
VMs on 1 array, but 2 6 disk SATA RAID10s should handle up
to 20 VMs nicely.
This analysis is irrespective of whether you run hardware
RAID or software RAID.
-Ross
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