Re: SLES10 SP1, Xen and SAN

2008/4/11, Stefan Kooman <[email protected]>:
>
>
>  Ciro Iriarte schreef:
>
>
> > Hi, I'm installing SLES10SP1 on a Proliant DL380 G5 to run Xen
> > Domains. Later, another machine will join the party, so I can have two
> > Xen hosts to move back and forth the VMs on the fly.
> >
> > The thing is, in a perfect world I would have a single LUN for all my
> > VMs and would use a cluster aware LVM solution to assign disks for the
> > domains.
> >
> > Back to reality, I don't want to use EVMS, since it adds another layer
> > of complexity and will be dropped in future releases of the distro.
> > Are there any other options than the next two?:
> >
> > - Use a big LUN with OCFS2 to host file based images, losing
> > performance & flexibility (i don't like it)
> > - Nag the SAN admin every time I need to add a new domain, so he
> > creates a new LUN for me (a 500GB, 20GB or 1GB one, who knows),
> > keeping performance, but losing flexibility (and maybe even wasting
> > disk space).
> >
> > Another question, can I use lvm inside paravirtual domains?, all the
> > guides I found advice to create volumes outside the domain to assing
> > them to FS, example:
> >
> > /dev/vmdisks/dom0-root
> > /dev/vmdisks/dom1-root
> > /dev/vmdisks/dom0-home
> > /dev/vmdisks/dom1-home
> > /dev/vmdisks/dom0-var
> > /dev/vmdisks/dom1-var
> > /dev/vmdisks/dom0-usr
> > /dev/vmdisks/dom1-usr
> >
>
>  You need to identify your SAN volumes in a unique way. You can use
> /dev/disk/by-id/volumename of /dev/disk/by-path/volumename which are unique
> across hosts and are created/destroyed automatically by SLES (and openSUSE).
> Your SAN should give each LUN a unique id. Make sure it does. In special
> cases like disaster recovery you might want to put a (replicated)snapshot
> off the LUN back online which might have the same name as the original.

I'll use multipathd for this.

>
>  Regards,
>
>  Stefan
>
> >
> > But this way I won't be able to have domains on different hosts, (a
> > safe way at least, since I need this to be reliable)
> >
> > Regards,
> > Ciro

Ciro
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