Re: [Xen-users] LVM2 snapshots and XEN = problem :(

[Luke Crawford <lsc@xxxxxxxxx>]

I have also avoided using snapshots so far for the same reasons.  I've 
also been looking at EVMS (as I have a SAN, but no raid controller, and 
I'd like to be able to give each domU a small fraction of a mirror and 
still be able to individually hot-migrate domains.  I believe this can be 
done with EVMS. see
http://www.archivesat.com/Xen_technical_preview_development/thread481214.htm
)

As for the LVM snapshot issues, I have avoided lvm snapshots so far out of 
fear of dom0 crashes.   Would it be possible for me to export the master 
volume read-only to all the domUs, then have the domUs each create and 
mount their own writable snapshot in DomU-space?  If it's in domU space, 
stability is less of a concern.

> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] LVM2 snapshots and XEN = problem :(
>
> On Friday 08 September 2006 4:59 am, Tobias König wrote:
> > So i upgraded the lvm and libdevmapper packages to these versions and the
> > removal of the snapshots work without problems.
> do you mean that the problem is in userspace and not on the kernel?  what
> about using EVMS for volume management? since it uses the same kernel
> facilities it might avoid the but if it's in userspace, but not if it's in
> kernelspace...
>
> i haven't been able to reproduce the problem, but it really makes me nervous
> to rely on snapshots for new designs
>
> --
> Javier
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