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Hi Amanda-users,
we are currently trying to improve performance (= speed) of our
amanda installation. I would like to address to problems: First the
writing speed to tape and second the speed of the dumping process.
The short question is: How do i configure amanda for optimum speed,
without switching off compression completely? The long question is
here:
Some informations about the hardware we use: The backup server is a
Athlon 1GHz PC with 256MB Ram and SCSI harddrives (holding disk is
IDE), network is 100MBit switched. Most backup clients are Pentium
III with about 256MB Ram and SCSI harddrives. Our backup medium is a
HP-DLT1 drive, which should be able to write about 6MB/s (if i can
believe HPs technichal description). I copied the tapetype definition
in the amanda.conf from a faq-entry on www.amanda.org. All machines
use Amanda 2.4.2pl2 on SuSE Linux 7.1.
A complete level 0 dump of all harddrives currently is about 45GB
(25GB compressed) and needs about 16 hours to run. In the current
disklist there are 14 machines with 39 harddrives/partitions to
backup.
When i look at the taper stats in the amanda report, some of the
harddrives we backup are written at a Speed of about 1MB/s to tape,
but most auf them are written with a speed of 300-500KB/s. We tried
to improve the writing speed by increasing the "tapebufs" entry in
amanda.conf from 32 (640KB?) to 256 (8MB?), but this didn't help.
The speed of the dumper process is always rather slow (IMHO), about
30-600KB/s. We played a little with client/server and best/fast
compression, but we didn't get a real performance boost... the
maximum was about 1MB/s when we switch off compression completely.
Thanks in advance,
Christoph Stoppe
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