Re: [Xen-users] Xen - LVM and RAID

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

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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