Re: [Xen-devel] consistent LVM snapshot of domUs from dom0

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

Hi there,

> thanks very very much for a reply, I was beginning to feel a bit sad that
> nobody replied :)

No problem!

> > xm create mydomain
> > xm fs_freeze mydomain
> > <do backup>
> > xm fs_unfreeze mydomain
>

Actually, an even better way (with better tools integration) would be:

xm create mydomain

xm fs_snapshot mydomain
  +---> freezes domain filesystem
  +---> does a block level snapshot with LVM or qcow
  +---> unfreezes domain filesystem

<user now backs up the snapshot at their leisure>

> Yes, I really like this way, and now the question is: do You think,
> that You could have a time to look at it in near future? Or should I try 
> to solve it? I do not have knowledge of xen internals to do it (yet?), but
> I'm trying to learn anyways, so maybe I could try to fix, if there would
> be somebody to give me some guidance ;)

It's mostly a question of Linux kernel hacking, I think, plus adding support 
to the Xen tools.  Xen itself would definitely not need to be touched.

I've actually been having a look at this today and trying to code up a little 
example implementation.  You're welcome to have a go too if you want, 
particularly if you're into kernel hacking.  But I'll put my code online if I 
get anywhere, anyhow.

> What do you think?

Lots of people seem to be interested in this sort of thing, so I think it's 
worth looking into.

Cheers,
Mark



-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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