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