Hi,
I've recently setup remote ssh backups from my work RH6.1 linux PC to one of
our Sun systems. The backup occurs once a week overnight. No problem with
this generally, in as much as it works (sort of) fine.
The PC is a 200Mhz system with an internal 6GB and 1 GB disk. The amount of
data being backed up is about 2GB from the 6GB disk. The Sun system is an
Ultra 10 running Solaris 8, and I'm using openSSH 2.1.1p1 on the Sun;
2.1.1p2 on the PC. Backup occurs over our local network, which may have its
problems but is generally okay.
When I was testing the setup - during the daytime - the backup took about
one hour. This was with me doing other things on the PC whilst it was going
on. Again, no problem.
I configured the backup to run overnight via cron on the PC. It was to start
at 1am. However, it took over 8 hours for the backup to complete! The
throughput from the log file shows it at about 73KB/s (from last nights
log). This takes it to about 09:30 by which time I am in work and login. I
can see the backup is still going, and when it comes to backup the final
small partition (5MB in size), it does this in a few seconds and with a
throughput of 712KB/s which is more like the throughput I get during the day!
So why is the backup taking so long? I have checked for overnight cron jobs
and disabled the cron.daily run (which kicks in at 4am). I ran top every
15mins (again via cron) overnight when the backup was not running, and could
not really see any problem. However the system did seem to be 'busy' during
the night despite no-one using the system. The %system and %nice values
seemed high (he says having now deleted the actual log file...:-( ) and
typically the system only ever got to about 60% idle. I get more than this
during the day (around 90% right now).
Anyone have any ideas about this?
Thanks,
John.
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John Horne, University of Plymouth, UK Tel: +44 (0)1752 233914
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