Hi all,
Am 28.01.2026 um 14:06 schrieb Stefan G. Weichinger via Bacula-users:
Am 28.01.26 um 08:58 schrieb Stefan G. Weichinger via Bacula-users:
The defs are shown in the first posting. *no* signature set. Is that
wrong/problematic?
added md5 sig for the most jobs on this fd for now
While md5 is IMO still good for bitrot detection (which we also do with
some CRC, but not at the file level) I'd recommend going for longer and
more collision resistant hashes.
The downside of them taking up more catalog space is rather minimal,
given all the other things we keep track of already. The potential
downside of them slowing down things is a very interesting topic for
some research :-)
Essentially, Bacula uses the openSSL functions. OpenSSL has built-in
speed test functions. OpenSSL is also, on many platforms, highly tunded.
On others, particularly RISC CPUs without crypto acceleration, all
software tuning will probably be pointless.
Anyway -- try something like
for c in md5 sha1 sha256 sha512; do openssl speed -bytes 65536 \
-seconds 10 -evp $c 2>/dev/null | grep -E '^'$c ; done
on your typival clients and see what you get.
(Also, I try to solve throughput bottlenecks that are due to CPU limits
by parallelizing backups, but that can be a challenge in itself, and in
many cases, it's not worth the effort anyway. Most of my backups do not
depend on particular tight backup windows, and if a backup finishes
after 15 minutes or 15 hours is not important.)
However, to your first question: I usually very strongly recommend to
set some signature in all of your file set options blocks. Of course
it's not wrong to not have any, but not having them does make it more
likely that certain errors go undetected.
Cheers,
Arno
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--
Arno Lehmann
IT-Service Lehmann
Sandstr. 6, 49080 Osnabrück
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