Repository on LVM filesystem snapshot

[Matt Mackall]

On Sun, Jul 05, 2009 at 04:17:22PM +0200, Lasse Kliemann wrote:
> Under Linux, LVM allows to take a snapshot of a filesystem.  
> (Solaris had a similar feature for years.) This is used in order 
> to take a backup (with rsync, tar, etc.) reflecting the 
> filesystem's state at a particular time. AFAIK there is no other 
> way to get that on a live filesystem.
> 
> Although the snapshot is consistent in that respect that it does 
> reflect a state of the filesystem at a point of time, this does 
> not mean that is is also consistent from the viewpoint of 
> applications. For instance, suppose there is a Mercurial 
> repository on the filesystem, and the snapshot is taken during a 
> transaction or similar. Then the original filesystem is lost 
> (say, due to hardware failure) and the admin restores it using a 
> copy taken from the snapshot. Is it guaranteed that this gives 
> again a fully-functional repository?

Yes.

-- 
Mathematics is the supreme nostalgia of our time.