[1577] in linux-scsi channel archive
Re: SCSI st module question
daemon@ATHENA.MIT.EDU (Mark Kazimer)
Thu Mar 20 11:58:48 1997
From: markk@corona.esg.apertus.com (Mark Kazimer)
To: gadio@netvision.net.il (Gadi Oxman)
Date: Thu, 20 Mar 1997 10:24:08 -0600 (CST)
Cc: andy@ws.realbig.com, makisara@abies.metla.fi, linux-scsi@vger.rutgers.edu
In-Reply-To: <Pine.LNX.3.91.970318123140.216A-100000@localhost> from "Gadi Oxman" at Mar 18, 97 12:41:56 pm
>
> On Mon, 17 Mar 1997, you wrote:
>
> > I am able to configure up to a 128K buffer, but not any more than
> > that. I am using a QIC-150 drive that constantly streams back and
> > forth with the standard buffer setting. It improves slightly when
> > bumping the buffer to 128K (from 32k), but still only streams for
> > a couple of seconds before it rewinds slightly for the next write.
> ...
> > What I want to know is if there is a way around this, or possibly
> > another solution?
>
> Try using the following double buffering utilities:
>
> 1. buffer, available in the package:
>
> sunsite.unc.edu/pub/Linux/kernel/tapes/tpqic02-support-1.9b.tar.gz
>
> (tar cvf - /usr | buffer > /dev/nst0)
>
> 2. or multibuf, available in the multibuf directory of KBackup:
>
> sunsite.unc.edu/pub/Linux/system/Backup/KBackup-1.2.9.tar.gz
>
> (tar cvf - /usr | multibuf -w -m 10 /dev/nst0)
>
> Gadi Oxman
> gadio@netvision.net.il
I tried Gadi's (and Kai's) suggestions, but unfortunately, the
double buffering didn't make a difference. My system is fast
enough to keep the kernel busy even without buffering.
It seems my SCSI tape drive will only stream in the amount of the
size of the kernel buffer. (128K)
So, plan B is to build a 1.2.13 kernel and use it when I need to
write to the tape.
Thanks for the suggestions... they were much appreciated.
--
Mark Kazimer markk@apertus.com Apertus Technologies, Inc.
(612)828-0296 FAX:(612)828-0773 Eden Prairie, MN 55344
http://web.apertus.com/~markk (02/07/96) http://www.apertus.com
--
All true wisdom is found on T-shirts.
