Re: consistent LVM snapshot of domUs from dom0

[Nikola Ciprich <extmaillist@linuxbox.cz>]

On Mon, 24 Dec 2007, Mark Williamson wrote:
Hi Mark,
is there some progress regarding this subject? Still, if there is 
something I could help with, please do not hesitate to tell me what could 
I do...
Cheers
Nik

>
> Yes, I think that's a sensible first step to take.  Later on, we could perhaps
> look into putting some more smarts in, e.g. doing the snapshot creation
> automatically in the case that an LVM volume or QCow virtual disk is already
> being used.
>
> I hadn't come across freeze/thaw_bdev before - I'd found a lock / unlock call
> for filesystem locking somewhere that looked promising but not implemented it
> yet.  I imagine it might boil down to a similar thing in the end.
>
> Either way, being able to freeze specific block devices could be useful for
> backup purposes.  There's no point freezing filesystems that are not used to
> store backed-up data, for instance!
>
>>
>> Yup, agree :)
>> Cheers!
>
> OK, I'll try and get some code online at some point and let you know when it's
> available.