From owner-freebsd-current Mon Dec 14 19:15:47 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id TAA00114 for freebsd-current-outgoing; Mon, 14 Dec 1998 19:15:47 -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 TAA29993 for ; Mon, 14 Dec 1998 19:15:32 -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 TAA04868; Mon, 14 Dec 1998 19:15:09 -0800 Date: Mon, 14 Dec 1998 19:15:09 -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: <19981215132144.H15633@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 > > You *can* enable/disable compression, and we could even make the change > > persistent across tape mounts, but the issue here is whether or not you > > also want to go and change the N different backup utilities to use the > > appropriate ioctl to select compression or not. > > Precisely. That would also include any tape utilities you port, and > any other program you may want to use to access tape. Specifying the > function in the device name seems the easiest solution to me. > The only problem with this is that the matrix of device names gets extremely unwieldy. It's not just compression, but perhaps density. Take a look at the Solaris tape name mess: /dev/rmt/U{l|m|h|c}[b][n] U == unit; l = low, m = med, h = high, c = compression; b = BSD semantics; n = norewind and this is where you've (incorrectly, in my opinion) smooshed compression in with density selection. I don't see an easy solution that makes sense (as yet- this requires a lot of thinking). -matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message