[Samba] Fwd: Shadow copy in Samba 4.0.3

SerNet Support Björn Baumbach samba at sernet.de
Thu May 2 03:09:45 MDT 2013


On 04/30/2013 09:51 PM, Ambika Arunachalam wrote:
> As discussed in the call, our configuration mounts the snapshot
> directory in parallel to the original mount point.(like
> /FILESYSTEMS/test and /FILESYSTEMS/snaptest)
> But it looks like the shadow copy module expects that the snapshot to be
> mounted under the original mount point's path tree. Hence it fails to
> find the snapshot directory.
> Please let me know if you need more information

yes, the default way using the shadow_copy2 module is to have a
.snapshot directory next to the stored data (or under the original mount
point), including the timestamp directories where snapshots are mounted.
The shadow:snapdir option does currently not work with absolute paths.
As far as I understand the code it's only possible to specify an
alternate name to ".snapshot".

With the current configuration (shadow:snapdir = /FILESYSTEMS) the
module searches for a snapshot directory "/FILESYSTEMS".
Trying to get older versions (snap shots/shadow copies) for a file
stored in e.g. /FILESYSTEMS/test/some/sub/dir/test.txt triggers the
module to search for the specified snap-dir in the the following way:
First the module checks for a snap-dir at

and then, if there is no path found, it walks through the path:
-> exit with "no snapshots found"

I'll discuss this issue with my colleagues Michael Adam and Volker
Lendecke to find the proper solution.

Best regards,

SerNet GmbH, Bahnhofsallee 1b, 37081 Göttingen
phone: +49-551-370000-0, fax: +49-551-370000-9
AG Göttingen, HRB 2816, GF: Dr. Johannes Loxen
http://www.sernet.de, mailto:kontakt at sernet.de

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