Dear Wayne,
Excellent, that's really what I have expected!
Is it stable now? Cause I have found that this feature seems to be
unstable before ver 3.0.6.
- Fixed a --read-batch hang when rsync is reading a batch file that was
created from an incremental-recursion transfer.
http://samba.anu.edu.au/ftp/rsync/src/rsync-3.0.6-NEWS
On Fri, 2009-05-29 at 23:48 -0700, Wayne Davison wrote:
> On Thu, May 28, 2009 at 11:32:16AM -0400, Matt McCutchen wrote:
> > - Each day, generate a reverse batch (by running rsync in the reverse
> > direction with --only-write-batch) and then update the destination file.
>
> In order to avoid any inconsistency between the files when the reverse
> run is done and when the backup copy is done, you could use a second
> full backup copy (though someone using something like LVM could use
> snapshots instead).
>
> To be explicit, a two-dir method would start by duplicating the backup
> dir (let's assume to a separate host, though it would also work without
> "bhost:" in all these commands):
>
> rsync -av /backup/ bhost:/backup2/
>
> Then a backup operation would be:
>
> rsync -av srchost:/src/ /backup/
> rsync -av --only-write-batch=/batches/$DATE bhost:/backup2/ /backup/
> rsync -av /backup/ bhost:/backup2/
And one more thing here:
If you are going to prepare this batch file, it seems there will be double the
workload of network, see below statements? Is that right?
> rsync -av --only-write-batch=/batches/$DATE bhost:/backup2/ /backup/
> rsync -av /backup/ bhost:/backup2/
>
> That results in the daily double-backup dirs and a batch that lets you
> get back to the prior day's files.
>
> A restore operation would require running a sequence of batch files into
> the /backup/ dir (without any backups running):
>
> rsync -av --read-batch=/batches/$DATE1 /backup/
> rsync -av --read-batch=/batches/$DATE2 /backup/
> ...
>
> Then, after restoring the file(s), revert /backup to the most recent
> backup data:
>
> rsync -av bhost:/backup2/ /backup/
>
> ..wayne..
--
Daniel Li
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