Re: [Xen-users] domU -->Failure: failed to start /dev/md1

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

Andy Smith wrote:
> Hi,
>
> On Sat, Sep 01, 2007 at 09:51:38PM +0100, Nico Kadel-Garcia wrote:
>   
> > Is there *ANY* reason to do software RAID, LVM, or other filesystem 
> > cuteness in a DomU? Except maybe for configuration testing purposes? Let 
> > the Dom0 do the work, I'm quite certain it will be more efficient about it.
> >     
> I generally agree, although I have some customers who want to manage
> their own filesystems with LVM, so for them I give them one block
> device with / on and another with nothing on for them to use as an
> LVM PV as they please.  So that ends up as LVM on LVM on RAID.  I'm
> sure there's a performance hit but haven't benchmarked exactly how
> much.
>
> It also has the advantage that when they want more disk space I can
> attach another block device and they can add this to their VG
> without having to reboot their domU.
>   
Hmm. OK, avoiding rebooting is useful. I've just found running LVM 
inside of LVM to be very awkward to gain access to the file systems form 
Dom0, and make snapshotting the DomU filesystem for off-line backup to 
be even riskier.
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