re[2]: Snapshots

[Greg Freemyer <freemyer@NorcrossGroup.com>]

 >>  On Thu, 2 May 2002, Greg Freemyer wrote:

 >>  > XFS team,
 >>  >
 >>  > I've just become aware of a problem on another Journaled file-system (it
 >>  is not a Linux filesystem).

 >>  A NAS device perhaps?

Thanks for the info, and no it is a normal everyday FS.  (And a mature one at that.  Atleast 5 years old, but I guess hardware snapshots are relatively new. )

The problem apparently occurs in both direct connect and SAN environments.

As I understand it the trouble is that some meta-data can be in transition even for just a few millisecs.  If the hardware snapshot is made at this time, you get corruption.

As you and Steve said, xfs_freeze looks like it is specifically designed to handle the problem, so I'm happy.

Greg Freemyer