I recently set up Bacula to backup a small cluster of machines.
However, some servers are backing up absurdly slow- 300kb/s. I noticed
this with a few servers, and thought maybe it was just a fluke- but most
seem to go this speed. I had a more powerful server that started
backing up around 10mb/s, but that speed dropped throughout the backup
so that the average speed was around 3mb/s (although this was before I
turned spooling on). I'm running Debian packages, recompiled with
--enable-openssl so that we could use encryption for our tapes ( a must
for our installation).
I tried setting up spooling to see if it was the tape drive, but it
didn't help. Compression is turned off, TLS is off, but I have
encryption turned on- I did a quick test without encryption, but it
didn't speed things up appreciably. While the backup is going on, I can
copy files through other means (scp, nc) between the machines at speed
around 15mb/s.
Here are the details about the setup between the two machines:
Machine running the file daemon:
- Connected with a 1000mb/s link (verified with mii-tool)
- 4x PIII @ 800MHZ. The bacula process consumes 100% of one cpu, but
the rest are sitting virtually unused.
- iostat shows that it's continually reading from the disk.
- strace'ing the process doesn't show anything unusual (it is opening
lots of files, then writing the data out, nothing appears to be hanging)
Machine running the storage daemon:
- Connected to a SCSI LTO-2 tape drive (not really relevant, because it
is currently spooling)
- While the backup is running, the load is very low ( 0.04, 0.01, 0.00 )
- iostat shows occasional disk writes, about once every 5 seconds or so
- bmon shows an rx rate that varies between 100 and 300 KiB/s
I'm baffled as to why Bacula would run so slow but everything else would
run faster, Any help would be greatly appreciated- I really like using
Bacula, but 300kb/s is intolerably slow.
Thanks, Joshua
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