FWIW the backups sped up considerably and finished after 1.5 days at an
overall transfer rate of about 1.5 MB/s. I'm really not sure what caused the
slowdown yesterday but the eventual speed up seems to imply an environmental
state on the machines that went away. I checked to see if the AV software
was doing full system scans, but it wasn't. Unless anyone has ideas on what
might have been causing the slowdown, I will consider this issue (more or
less) resolved. Thanks anyway.
From: Jeff Shanholtz [mailto:jeffs...@shanholtz.com]
Sent: Wednesday, August 03, 2011 5:31 PM
To: Bacula-users@lists.sourceforge.net
Subject: [Bacula-users] performance problem
I currently have 3 clients doing a full backup (simultaneously). According
to "status client" one is getting 300kb/s (this one is my director and
storage server machine), one is getting 225kb/s, and one is getting 50kb/s.
I've disabled AV on access scanning for the bacula-fd.exe process. I have
software compression enabled, but none of the 3 systems seem bogged down so
I think the bottleneck is not due to that option (although I'm tempted to
turn on ntfs compression on the backup drive and disable software
compression in the future).
For the most part I don't mind too much that the backups are so slow because
I'm quite happy to see the client machines continuing to be quite snappy.
The main concern, particularly for full backups (which at this rate will
take upwards of 3 days to complete), is the possibility of a system going
offline and thus killing the backup (or will it pick up where it left off,
as long as I have FD Connect Timeout configured to be longer than a system
would typically be offline for, e.g. 12 hours?).
So what else could be coming into play with my poor performance? Are
simultaneous backups problematic performance-wise? I've watched the I/O
activity of bacula-sd.exe and it certainly doesn't seem to be maxed out. It
is using an external USB2 hard drive. Could the difference between USB2 and
eSATA be the key? I can connect them as eSATA if I really need to. Seems
like USB2 should be allowing substantially more than the roughly 600kb/s
overall speed I'm getting though.
I'm running all Windows Bacula binaries, version 3.0.3. I'm not sure posting
config files is necessary at this point, although I'm happy to do so if
needed.
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