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- From: zeke@fasttech.com (Bohdan Tashchuk)
- Newsgroups: comp.unix.sys5.r3,comp.unix.sysv386,comp.unix.questions,de.comp.os.unix
- Subject: Re: [ISC] SCSI Tape Problem
- Message-ID: <1993Jan9.002255.5676@fasttech.com>
- Date: 9 Jan 93 00:22:55 GMT
- Article-I.D.: fasttech.1993Jan9.002255.5676
- References: <1993Jan5.015125.182@fns.gold.sub.org>
- Organization: Fast Technology Beaverton, OR
- Lines: 31
-
- First, please don't post to the obsolete group comp.unix.sysv386.
- I had to change my active file just to be able to respond to you.
- Of course, I'm perpetuating this by responding here.
-
- In <1993Jan5.015125.182@fns.gold.sub.org> root@fns.gold.sub.org (Peter Bechtold) writes:
- >386-33 ISA, 2 * ST1239A Seagate IDE drives w/ ST08 IDE host adapter,
- >Tandberg 3820 SCSI tape w/ ADAPTEC 1542B SCSI host adapter, Tseng Lab ET 4000
- >VGA card, AST 4 serial card.
-
- >The OS is ISC 2.0.2 w/ standard ADAPTEC driver.
- >The problem is: Any tape access (read and write) is VERY slow.
- >Any hints ?
-
- Your message didn't make clear whether or not you are using the ISC
- menu-driven backup to access the tape. When I did, I also had speed
- problems with my SCSI tape.
-
- I followed the shell scripts down to the actual cpio instruction that
- they used. This cpio didn't have a buffer size specified. I found that
- if I added/changed the appropriate line toward the top of the
- /usr/admin/menu/filemgmt/backup
- script to
- ncpioargs=-C262144
- that my tape began streaming quite nicely. (I'm not sure about the
- syntax of the 'spaces' in this line. I'm working off my paper notes,
- and have since upgraded my ISC versions.)
-
- Other hints: You want to make sure you haven't starved the SCSI controller
- by screwing with the DMA on/off times. Also, as someone else has pointed
- out, you may need to change jumpers on your tape drive. I have an Archive
- 2150S and the factory jumper settings worked.
-