Re: consistent LVM snapshot of domUs from dom0

[Nikola Ciprich <extmaillist@linuxbox.cz>]

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

On Sat, 8 Dec 2007, Mark Williamson wrote:

> If your LVM is running in dom0 and you snapshot the storage used by a domU
> then, no, it won't snapshot the domU's filesystem automatically.
OK, good to know there is a problem to solve :)

> You're quite right.  I've just had a look at it and it looks quite feasible to
> do this.  The obvious simple way to implement it would be to add an xm
> command that causes a domain to freeze its filesystems into a consistent
> state and then return when that is done.
> e.g.
>
> xm create mydomain
> xm fs_freeze mydomain
> <do backup>
> xm fs_unfreeze mydomain
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 ;)
What do you think?

Anyways thanks a lot for Your time once more
nik