Re: [Xen-devel] Automation scripts

[Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>]

On Tue, Sep 28, 2004 at 09:21:12AM -0500, Brian Wolfe wrote:
> I'm far from having a working automated system right now. I still have
> the iSCSI death issues to deal with when combining 2 iSCSI target
> devices into a raid-1 array in Domain-0 to be exported to the XenLinux
> unprived domain. 8-( NFS roots still periodically "lock up" momentarilly
> (~2 to 10 seconds) when using nfs root. SO the solution isn't ready yet.
> I do highly reccomend that people use LVM LVs for individual exportable
> block devices and to forget about using COWs to "save space". Adding a
> 200GB disk is dirt cheap (unless you are talking about scsi) so it's not
> worth the savings IMHO to multi-cow a filesystem into 2+ unprived
> domains on a single machine. The 1 to 2 GB of saved space just isn't
> worth it at $0.10 per GB of disk space. :) Add in the system overhead
> and seek times required for COWs after your first FS upgrade and your
> return is worse than using separate partitions/LVs in my experience. 

I think the best use one could get from LVM snapshots is background
cloning of filesystems, i.e. you'd use a modified snapshot driver
which would slowly create a 1-to-1 copy of the whole partition but
allow it to be used immediately, copying being done when the
disk/machine is otherwise idle.

    christian



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