Hi. On an OpenAFS Installation here we're doing nightly volume backups with vos backupsys at 0:30 and the backup volumes are dumped during the day with vos dump.
There's a monthly level 0 backup without a timestamp, done with
/usr/sbin/vos dump -id root.afs.backup -local
And after that incremental dumps are run with e.g.:
/usr/sbin/vos dump -id root.afs.backup -time 03/09/2009 00:30 -local
i.e. in this case the level 0 dump was done on the 9th march 2009.
Today we noticed that the size of the incremental dumps is non-zero
for some volumes which have not changed in quite a while.
e.g. we have a volume that hasn't changed in over 2 weeks
vos exa gives the following output for the RW-replica:
,----
RWrite 536871467 ROnly 0 Backup 536871469
MaxQuota 8388608 K
Creation Mon Sep 29 16:48:08 2008
Copy Mon Sep 29 16:48:08 2008
Backup Wed Mar 11 00:33:03 2009
Last Update Wed Feb 25 15:25:53 2009
65453 accesses in the past day (i.e., vnode references)
RWrite: 536871467 Backup: 536871469
number of sites -> 1
`----
The incremental dump of that volume is 50MB in size, the level 0 dump
being 4GB.
We found some other volumes that had not changed since March 9th, and
there doesn't seem to be a relation between the size of the full and
incremental dumps.
e.g. we have: 4GB vs. 7.8MB in one case and 1.7GB vs. 172MB in
another.
In one case it was observed that the size of the incremental dump
seems to increase by about one block a day.
Running unpatched 1.4.8 openafs, both client and server running
openSUSE, 11.1 on the server, kernel 2.6.27.7, 10.3 on the clients
with kernel version 2.6.22.19.
Can anybody explain this? Is it a bug, a feature, a configuration
error?
If you need any more information, please feel free to ask!
Kind regards
Friedel
--
Dipl.-Inform. Friedrich Delgado Friedrichs (Projekt- und Entwicklungsteam)
DFN-CERT Services GmbH, https://www.dfn-cert.de, Phone +49 40 808077-555
Sitz / Register: Hamburg, AG Hamburg, HRB 88805, Ust-IdNr.: DE 232129737
Sachsenstraße 5, 20097 Hamburg/Germany, CEO: Dr. Klaus-Peter Kossakowski
16. DFN-Workshop Sicherheit in vernetzten Systemen
https://www.dfn-cert.de/ws2009/
smime.p7s
Description: S/MIME cryptographic signature
