[Linux-cluster] Snapshotting GFS and freezing

Dirk H. Schulz dirk.schulz at kinzesberg.de
Fri Jan 15 06:06:53 UTC 2010

Hi Jeff,

Jeff Sturm schrieb:
> The important consideration here is:  How long can you withstand the
> filesystem being frozen?
> You can freeze it, copy all files (e.g. with rsync) and unfreeze,
> potentially over the course of a few hours.  If that's okay with your
> application and users, go right ahead.
> Or you can freeze, snapshot and unfreeze, and potentially be done within
> a few seconds.  That's the beauty of snapshots--we do it online with
> little or no user disruption.
That means you can unfreeze gfs before undoing the snapshot? The 
snapshot has to be CREATED with frozen gfs but can go on WORKING with 
unfrozen gfs?
If that is right I would like to understand this in detail. Why does gfs 
have to be frozen for creating a snapshot?

> -Jeff
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