Re: Backup with Dump very slow
From: Ryoko (ryoko_at_-no-spam-.talk21.com)
Date: 10/18/04
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Date: 18 Oct 2004 07:50:43 GMT
"David Bernard" <jerrydav@hotmail.com> wrote in
news:NPFcd.23985$H45.616896@weber.videotron.net:
> I have a small personnal server running OpenBSD 3.4 and tried for the
> first time the "dump" utility to backup a 4 GB partition towards a
> local network share (mounted with sharity-light). The backup
> throughput is extremely slow, around 80 MB per hour!! Is there a way
> to speed things up even if "dump" has been designed to use tape
> drives? Do you think "rsync" will be faster?
I don't think that dump is the bit that is being slow - but there are
many factors.
On a faily new pc (i.e. 1GHz + loads of ram ...) I've successfully used
dump 0f - (.....) | gzip | ssh remote_machine "dd
of=backed_up_filesystem.dump.gz"
to backup much larger disks than that
What is your network connection ... and how efficient do you think
sharity-light is? Is the server the bottle neck ...?
break down what you are doing and time the steps.
e.g. dump -0af /dev/null /dev/rd0g
that will tell you how fast the dump is with no file creation ...
then look at just copying 2 Gig or wahtever to your server via different
mechanisms
e.g. a dump of about 2 Gig completed in 7 mins
naru# date; dump -0af /dev/null /dev/rwd0g; date
Mon Oct 18 09:43:34 BST 2004
DUMP: Date of this level 0 dump: Mon Oct 18 09:43:34 2004
DUMP: Date of last level 0 dump: the epoch
DUMP: Dumping /dev/rwd0g (/usr) to /dev/null
DUMP: mapping (Pass I) [regular files]
DUMP: mapping (Pass II) [directories]
DUMP: estimated 2990343 tape blocks.
DUMP: Volume 1 started at: Mon Oct 18 09:43:41 2004
DUMP: dumping (Pass III) [directories]
DUMP: dumping (Pass IV) [regular files]
DUMP: 67.39% done, finished in 0:02
DUMP: 3183113 tape blocks on 1 volume
DUMP: Volume 1 completed at: Mon Oct 18 09:50:56 2004
DUMP: Volume 1 took 0:07:15
DUMP: Volume 1 transfer rate: 7317 KB/s
DUMP: Date of this level 0 dump: Mon Oct 18 09:43:34 2004
DUMP: Date this dump completed: Mon Oct 18 09:50:56 2004
DUMP: Average transfer rate: 7317 KB/s
DUMP: Closing /dev/null
DUMP: DUMP IS DONE
Mon Oct 18 09:50:56 BST 2004
naru#
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