Date: Fri, 27 Jan 1995 06:50:47 -0500 (EST) From: Peter Dufault <dufault@hda.com> To: terry@cs.weber.edu (Terry Lambert) Cc: john@pyromania.apana.org.au, hackers@FreeBSD.org Subject: Re: SyQuest works with FreeBSD 2.0R ! Message-ID: <199501271150.GAA07921@hda.com> In-Reply-To: <9501261631.AA24506@cs.weber.edu> from "Terry Lambert" at Jan 26, 95 09:31:55 am
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Terry Lambert writes: > > > > > I have just installed a SyQuest 3.5" 270 MB removable SCSI drive in my > > FreeBSD 2.0R system. > > > > So far everything seems to work just fine! > > I was speaking to Darren Davis (the author of IOmega's Bernoulli drivers > for various types of UNIX, and now in UnixWare developer support at Novell) > about removable media about a year ago. > > You need to be careful if you have more than one drive that you only use > a single disk in a single drive for a system boot instance, since the > OS (incorrectly) uses the device as part of the ident, and can get > confused if you switch drives. I don't follow this. Is this a FreeBSD problem? > > Otherwise, you should have no problems. Actually, I think he will have a problem - UNIT ATTENTION is generated when the removable drive is changed. 2.0R doesn't retry at all on this, and 2.0-current will retry but not for removable drives because of the chance of someone swapping a mounted drive. I think we have to track the "first access after open" and retry even for removable drives in that case. I'd like a description of what happens when you unmount a file system, change the media, and try to mount a filesystem on a removable drive, including dmesg output. > Note that Bernoulli's themselves have formatting issues -- they don't use > a vendor private for their detach format. If anyone else is considering > Bernoulli vs. Syquest, this should be part of their decision. > > Also dual Bernoulli's and dual Syquest use LUNs on a single target to > get two devices. Some of the SCSI drivers are "uncomfortable" with LUNs. > I would suggest seperate drives at this time. Which drivers are uncomforable with LUNS? They shouldn't be too hard to fix. We need some pioneers... Peter -- Peter Dufault Real Time Machine Control and Simulation HD Associates, Inc. Voice: 508 433 6936 dufault@hda.com Fax: 508 433 5267 -- Formerly hd@world.std.com. E-mail problems? Tell hdslip@iii.net
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