Re: Snapshots

[Steve Lord <lord@sgi.com>]

On Thu, 2002-05-02 at 11:47, Greg Freemyer wrote:
> XFS team,
> 
> I've just become aware of a problem on another Journaled file-system (it is not a Linux filesystem).
> 
> With this filesystem, the meta-data can be out of sync during a snapshot operation.
> 
> If this happens, the snapshot is corrupt and can't be counted on to be a valid backup.
> 
> They are introducing a new feature for it: "freeze/thaw".
> 
> The idea is that you issue a freeze prior to taking the snapshot and a thaw after the snapshot is complete.
> 
> Does XFS have any similar problems, and if so are there fixes in place, or in the pipeline.
> 
> Note that this was a very occasional problem on the other filesystem, so anecdotal statements of it "works fine for me" may not mean much.
> 
> 
> Greg Freemyer
> 

man xfs_freeze

Or if you have the correct LVM patches in place then the kernel does it
all for you.

Steve


-- 

Steve Lord                                      voice: +1-651-683-3511
Principal Engineer, Filesystem Software         email: lord@sgi.com