Re: Slow dumper
2003-04-02 23:18:49
On Wed, 2 Apr 2003 at 9:29pm, Gene Heskett wrote
> On Tue May 28 2002 05:09, Bartho Saaiman wrote:
> >I have a problem where my dumper is slow and the taper seems to be
> > faster:
> >
> >
> >STATISTICS:
> > Total Full Daily
> > -------- -------- --------
> >Estimate Time (hrs:min) 0:02
> >Run Time (hrs:min) 11:21
> >Dump Time (hrs:min) 9:42 9:42 0:00
> >Output Size (meg) 14818.3 14818.3 0.0
> >Original Size (meg) 20804.7 20804.7 0.0
> >Avg Compressed Size (%) 71.2 71.2 --
> >Filesystems Dumped 1 1 0
> >Avg Dump Rate (k/s) 434.8 434.8 --
> >
> >Tape Time (hrs:min) 1:37 1:37 0:00
> >Tape Size (meg) 14818.4 14818.4 0.0
> >Tape Used (%) 74.1 74.1 0.0
> >Filesystems Taped 1 1 0
> >Avg Tp Write Rate (k/s) 2606.1 2606.1 --
> >
> >Is there a way of changing this to speedup backups.
>
> However, in most cases, the speed of the drive itself will be the
> overriding consideration of how long it takes to backup 14
> gigabytes. To use my own DDS2 drive and its about 390k/second
> speed, 14 gigabytes would take nominally 10 hours, plus whatever
> time the compression utility itself took. Your drive seems to
> indicate its doing 434k/second, slightly faster than mine. so
> you're doing it marginally faster.
Actually, Gene, I think you missed it. His tape is doing just fine (Avg
Tp Write of ~2.5MB/s). It's his dump rate that's the limiting factor
here. How is your system set up? Are you dumping to a holding disk on
the same physical drive? What hardware and OS are we talking here? What
are you using for a backup program?
--
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University
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