Re: [Xen-users] COW-backed VBDs

["John Fairbairn" <webmaster@xxxxxxxxxxxx>]

> or use a CoW NFS server (someone in
> Cambridge developed one but I don't know if the code is floating around).

If you happen accross it I'd love to see it :)

> I'll be working on a CoW filesystem also, later this year.

Great to hear Mark. I'll be looking forward to it. :)

Cheers,
John Fairbairn


>> I have asked this question before about COW backed VBD support in Xen.
>> It
>> would be really cool if I could share the same root FS between domains,
>> each having its own COW system.
>
> Indeed.
>
>> I am typically using file-backed roots. Does Xen (as User-mode linux)
>> provide utility to create COW disks (linked to a readOnly main disk)
>> which
>> can be used as VBDs.
>
> You can use LVM2 snapshots or the Device Mapper to create a COW virtual
> device.  LVM, at least, seems to have some issues with scalability when
> doing
> lots of CoW-ing though - make sure dom0 has enough memory.
>
> The other way of doing things is CoW at the filesystem, rather than at
> block
> level.  E.g. combine NFS and UnionFS or use a CoW NFS server (someone in
> Cambridge developed one but I don't know if the code is floating around).
> I'll be working on a CoW filesystem also, later this year.
>
> Cheers,
> Mark
>
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>



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