Re: Interrupted xfsdump Resume Behaviour for Regular Dump File

[Bill Kendall <wkendall@sgi.com>]

If you look at the inventory after an interrupted backup, it
will indicate the stream (and media file) start and end points.
If the end point is "ino 0 offset 0", then a resumed restore
will end up backing up everything again.

If you can, please try this with the top-of-tree code from
the git tree on kernel.org. I did a quick test and it seems
to be working there.

Note that if you're backing up to stdout, xfsdump cannot
determine when the output is safely on media, so a resumed
backup will always be a full backup.

Bill

Gim Leong Chin wrote:
> Hi,
> 
> I have observed this since some time back.  I have just done an experiment.
> 
> 1) Using xfsdump 3.0.6, I first did a full dump to regular file and restore, checked that every thing is correct.
> 
> 2) I then did the same dump again, but interrupted it.  Then I resumed the dump.  I noted that the resumed dump file is the exact same size as the full dump file.
> 
> 3) First I did a cumulative restore, with the interrupted dump file, followed by the resumed dump file.  I checked that the restore is correct.
> 
> 4) I then did a non-cumulative restore, using only resumed dump file.  The resume is successful, and I checked that the restore is correct.
> 
> The logs are attached.
> 
> The conclusion is that the so-called resume of an interrupted dump session to regular file produces a full dump file, that is sufficient by itself to do the full restore.
> 
> Are my observations of the behaviour of xfsdump correct?
> 
> 
> Everything was done on openSUSE 11.4 x86_64.
> 
> 
> GL
> 
> 
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