On Mon, 29 Aug 2005, Romain wrote:
Now I have bacula backuping 30 servers and it seems to work fine. I
backup 1,5GB a day and the total file retention is near 52 Gb.
The problem is that all backups seem to run very slow. The average
bitrate I have is between 600 and 700 kb/s. But all my servers are
plugged on 100Mb switches and the backup server is composed with 3
RAID5 146 Gb 10kt SCSI disks (note : all backups are made direct to
disk).
My experience is that the bottleneck is not archiving the files -- to
tape or file or whatever -- but inserting the file attributes into the
storage database.
Worst case on our network is our cvs/subversion server that hosts 2.2
million files taking up only 90 GB of space. It takes only 4 hours to
write the data to an LTO-1 tape drive. It then takes 26 hours to
insert 715 MB of file attributes into the sqlite database. The
archiving operation is quite fast, ca. 6.4 MB/s, but the overall rate
is only in the range of 820 KB/s.
Best case for us is our mail server, which still uses the old mailbox
storage, with many messages per file, so we back up lots of data in
relatively few files. With far less attribute spooling, these backups
run 3.5 to 4 times faster (overall) than the worst case.
My suggestion would be for you to identify the local bottleneck a bit
more thoroughly. If the database operations are slowing you down, you
might consider moving to a more efficient RDBMS or beefing up your
server (faster disks, more RAM, ...).
--
Paul Heinlein <> [EMAIL PROTECTED] <> www.madboa.com
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