On Tue, 16 Jul 2002, Andreas Dilger wrote:
> This is all done already for both LVM and EVMS snapshots. The filesystem
> (ext3, reiserfs, XFS, JFS) flushes the outstanding operations and is
> frozen, the snapshot is created, and the filesystem becomes active again.
> It takes a second or less.
Anyway, we could do that in parallel if we did it like that:
sync -> significant data is being written
lock -> data writes stay cached, but aren't written
snapshot
unlock -> data is getting written
now unmount the snapshout (clean it)
write the modified snapshot to disk...
Regards,
Thunder
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