[2151] in linux-scsi channel archive
Re: Tape writing s-l-o-w
daemon@ATHENA.MIT.EDU (Pete Popov)
Sat Jul 12 19:30:01 1997
To: physmsa@cantua.canterbury.ac.nz (Mr M S Aitchison)
cc: linux-scsi@vger.rutgers.edu
In-reply-to: Your message of "Fri, 11 Jul 1997 10:49:44 +1200."
<199707102249.KAA06917@cantua.canterbury.ac.nz>
Date: Thu, 10 Jul 1997 19:08:10 -0700
From: Pete Popov <pete@jones.asd.sel.sony.com>
Mark,
> A 66MHz 486 running Linux with a T130 card and DAT tape is very slow
> writing a tape (about 10Mb/minute) using simple things like tar. Yet
> the same card and tape with a Pentium running Win95 and arcadia
> software gets a decent speed.
What DAT drive do you have? What transfer rate do you get with
arcadia's software?
Try using larger transfer sizes: "tar -cb 120 -f /dev/nstX file".
> I would have thought that the 486 would have enough speed to keep the
> tape streaming, even with a SCSI card like this. Could there be
> something wrong with the software setup, or do we have to upgrade some
> hardware? (It would be a nuisance installing Linux on the Pentium, or
> upgrading the 486 just in case that will fix it). Has anybody got a
> combination like this running smoothly??
I do, but it's a Pentium 150MHz system with 64MB RAM. I get about
70MB/minute on my SDT-7000 drive, which is less than what the drive
is capable of (with 2/1 compression), but it's the same rate I get on Win95.
Pete
