Return to BSD News archive
Xref: sserve comp.os.386bsd.questions:5218 comp.os.386bsd.development:1228 Path: sserve!newshost.anu.edu.au!munnari.oz.au!yarrina.connect.com.au!belfast.dcd.wa.gov.au!belfast.dcd.wa.gov.au!not-for-mail From: juliane@belfast.dcd.wa.gov.au (Julian Elischer) Newsgroups: comp.os.386bsd.questions,comp.os.386bsd.development Subject: Re: SCSI tape questions Date: 20 Sep 1993 10:19:00 +0800 Organization: Dept of Community Development, Perth, Australia Lines: 36 Distribution: world Message-ID: <27j3uk$k2l@belfast.dcd.wa.gov.au> References: <27g4hp$uu@homer.cs.mcgill.ca> NNTP-Posting-Host: belfast.dcd.wa.gov.au In article <27g4hp$uu@homer.cs.mcgill.ca> storm@cs.mcgill.ca (Marc WANDSCHNEIDER) writes: > 1. On the suns I used to work with, if the SCSI tape drive > was an Exabyte drive, nrst0 would be used for 8200s, and > nrst8 would be used for 8500s. YOu could also use nrst0 > for 8500s in 8200 mode (or whatever it's called). > Is there a similar mechanism in the BSD-du-jour code...? > How does this relate to 2GB DAT drives...? yes, each of teh 4 groups of minor numbers can be assigned a different density e.g. 0-3, 4-7, 8-11, 12,15 can each have different densities.. (you have to have a resonably new scsi system, and I don't know what teh density number for 2GB DAT is.. you can set the density using the st(1) program (with man page!) distributed with teh scsi system. > 2. In /usr/include/sys/mtio.h, there are abunch of MT_IS* > constants indicating which tape drive one has. However, > there are a whole PILE Of drives not listed here. Does > that mean that mt -fxxxx status is just going to barf saying > it doesn't know what the drive is, or will the system > just map it to the closest code possible.... since the driver does not return a type code.. (there are too many) this can be ignored.. BTW st(1) is a superset of mt(1) and may replace it some time (needs more work really). st(1) can report back the densities presently active on the four virtual devices associated with each device. > The reason I'm asking all these questions is that I plan to > purchase a 2GB Sony or WangDAT DAT drive in the future and > do a bunch of fiddling with the dump, mt, and rmt commands... I run a DAT at the moment (WangDAT 1300) and have no problems with it. julian