[Xen-users] Software RAID in DomU - does it work?

[Anthony Wright <anthony@xxxxxxxxxxxxxxxxx>]

I'm playing around with a file server as a Xen DomU, and as part of that 
I'd like to implement software RAID on the disks. From an architectural 
point of view, I'd like to keep all the file system components within 
the DomU.
I'm looking at taking the raw disks (/dev/hd?? & /dev/sd??) from Dom0 
piping them through to DomU as vbds, and then implementing software RAID 
on top of these vbds within the DomU.
This makes a lot of sense architecturally, but I'm concerned that there 
may be an additional layer of write buffering going on in Dom0 which 
will be invisible to the software RAID in DomU, but which may cause data 
to be written to the physical disk in a different order to that expected 
by the software RAID with the effect that it breaks the software RAID.
It's a bit hard to test this, so I wondered if anybody knows a little 
more about how the disk writes are processed in Dom0, whether they are 
buffered and whether this would have any effect on software RAID.
Thanks,

Tony Wright

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