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xen-users
Re: [Xen-users] Xen - LVM and RAID
Thomas Bellembois wrote:
Hello,
I wonder if we can use RAID (hard) under LVM for Xen domU.
What kind of RAID is recommanded ?
I was thinking about the following configuration:
- RAID 1 (two 70 GB disks) for the dom0
- RAID 5 (three 285 GB disks) for domU on LVM partitions
Any idea ?
Regards,
Thomas
Yes. *NEVER* do RAID *inside* a DomU. Every cycle in DomU for disk
management has to be filtered down to the hypervisor anyway, and
software RAID is thus a complete waste in DomU. Leave the disk
management to the Dom0, because all you're doing is adding a layer of
complexity to the DomU interactions with hardware that buy you *nothing*
unless your software itself is capable of corrupting the internal
filesystem and you want to poke around with it. But usually there's no
point.
Now, if you mean setting up 3 disks on Dom0 using RAID5, great. Better
yet, use a cheap hardware controller and keep the RAID processing off of
Dom0, too.
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