From owner-freebsd-questions Fri Mar 29 23:23:45 1996 Return-Path: owner-questions Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id XAA19569 for questions-outgoing; Fri, 29 Mar 1996 23:23:45 -0800 (PST) Received: from genesis.atrad.adelaide.edu.au (genesis.atrad.adelaide.edu.au [129.127.96.120]) by freefall.freebsd.org (8.7.3/8.7.3) with ESMTP id XAA19560 Fri, 29 Mar 1996 23:23:37 -0800 (PST) Received: from msmith@localhost by genesis.atrad.adelaide.edu.au (8.6.12/8.6.9) id SAA25861; Sat, 30 Mar 1996 18:13:16 +1030 From: Michael Smith Message-Id: <199603300743.SAA25861@genesis.atrad.adelaide.edu.au> Subject: Re: Other disks of Pioneer DRM-624X changer To: frankd@yoda.fdt.net (Frank Seltzer) Date: Sat, 30 Mar 1996 18:13:16 +1030 (CST) Cc: broome@msiadmin.cit.cornell.edu, paulb@online1.magnus1.com, jmb@freefall.freebsd.org, questions@FreeBSD.org In-Reply-To: from "Frank Seltzer" at Mar 29, 96 11:43:43 pm MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-questions@FreeBSD.org X-Loop: FreeBSD.org Precedence: bulk Frank Seltzer stands accused of saying: > > > > But a message in this group about a month ago said that the ch device is > > for scsi tape changers and that cd was for cdroms, including changers. > > A quick look at the kernel config file LINT says: > > device ch0 #SCSI media changers > > It is not specific in what media changers it is required. I assumed > (maybe incorrectly) that this applies to all SCSI changers, including CDROMs. Multidisk CDrom's aren't implemented using a seperate changer device - that would make no sense, as you could only change to a new disk after unmounting (and thus unlocking) the current one. Instead, the drive appears as several drives on the same ID but different LUNs. Thus, no seperate changer device, and thus no need for the 'ch' device. > Frank -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] Collector of old Unix hardware. "Where are your PEZ?" The Tick [[