>>>>> On Sat, 26 Apr 2008 12:40:14 -0700, Joshua Hutchins said:
> 
> 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.

If the file daemon uses 100% of the cpu, then that must be the bottleneck.
Are you using software compression or encryption?

__Martin

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