From owner-freebsd-current Mon Dec 14 19:31:33 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id TAA02091 for freebsd-current-outgoing; Mon, 14 Dec 1998 19:31:33 -0800 (PST) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from feral-gw.feral.com (feral.com [192.67.166.1]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id TAA02086 for ; Mon, 14 Dec 1998 19:31:31 -0800 (PST) (envelope-from mjacob@feral.com) Received: from localhost (mjacob@localhost) by feral-gw.feral.com (8.8.7/8.8.7) with ESMTP id TAA04941; Mon, 14 Dec 1998 19:31:15 -0800 Date: Mon, 14 Dec 1998 19:31:15 -0800 (PST) From: Matthew Jacob X-Sender: mjacob@feral-gw Reply-To: mjacob@feral.com To: Greg Lehey cc: freebsd-current@FreeBSD.ORG Subject: Re: Tape Driver Changes Proposed: Tape Early Warning Behaviour In-Reply-To: <19981215135448.B15815@freebie.lemis.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > > Well, you don't have to go overboard. Combine compression and > density. We have BSD semantics, I suppose, so the only other thing is > no rewind, which we already cater for. So for, say, an Exabyte > 8505XL, you'd have: > > /dev/rst0l 8202 mode, no compression > /dev/rst0n 8202 mode, compression > /dev/rst0h 8205 mode, no compression > /dev/rst0c 8205 mode, compression > /dev/nrst0l 8202 mode, no compression, no rewind > /dev/nrst0n 8202 mode, compression, no rewind > /dev/nrst0h 8205 mode, no compression, no rewind > /dev/nrst0c 8205 mode, compression, no rewind > > Sure, it's more than now, but it shouldn't confuse people too much. > Cool, but there are four possible densities in the current data structures. And speeds (has anyone actually ever found a drive that *uses* these?). And multiple compression algorithms to select from. I'm kind of inclined to think that the compromise of Rew/Norew X Compress/Nocompress X Low/High density is sufficient as long as you can establish that the latter two categories are a persistent (not through reboot, tho) cache of possible values that you can set via the mt(1) command. -matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message