From owner-freebsd-questions@FreeBSD.ORG Fri Mar 12 22:20:14 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id B98A616A4CE for ; Fri, 12 Mar 2004 22:20:14 -0800 (PST) Received: from sccrmhc11.comcast.net (sccrmhc11.comcast.net [204.127.202.55]) by mx1.FreeBSD.org (Postfix) with ESMTP id 64F7943D1D for ; Fri, 12 Mar 2004 22:20:14 -0800 (PST) (envelope-from underway@comcast.net) Received: from localhost.localdomain (c-24-17-47-224.client.comcast.net[24.17.47.224]) by comcast.net (sccrmhc11) with ESMTP id <20040313062013011005qdt3e>; Sat, 13 Mar 2004 06:20:13 +0000 Received: from localhost.localdomain (localhost [127.0.0.1]) i2D6KrUs018703; Fri, 12 Mar 2004 22:20:53 -0800 (PST) (envelope-from underway@comcast.net) Received: (from jojo@localhost) by localhost.localdomain (8.12.11/8.12.11/Submit) id i2D6KmCt018702; Fri, 12 Mar 2004 22:20:48 -0800 (PST) (envelope-from underway@comcast.net) To: "Robert Huff" References: <16466.1922.530743.83821@jerusalem.litteratus.org> <002d01c40881$9fdcaf20$0200000a@redline> From: underway@comcast.net (Gary W. Swearingen) Date: Fri, 12 Mar 2004 22:20:47 -0800 In-Reply-To: <002d01c40881$9fdcaf20$0200000a@redline> (Craig Reyenga's message of "Fri, 12 Mar 2004 17:30:29 -0500") Message-ID: User-Agent: Gnus/5.1002 (Gnus v5.10.2) XEmacs/21.4 (Reasonable Discussion, berkeley-unix) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii cc: questions@freebsd.org Subject: Re: hardware: backup tape reliability X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 13 Mar 2004 06:20:14 -0000 > From: "Robert Huff" > To: > Sent: Friday, March 12, 2004 1:54 PM > Subject: OT: hardware: backup tape reliability > >> >> I have a friend who's trying to implement a back-up regime, >> but running into media issues. >> Specifically: they live in an area with extremely high >> temperature+humidity (90-95 F/32-35 C; 90+% hum.) and climate >> conditioning is not an option. They need to backup critical data >> files (code base is not an issue) and have tried floppies, ZIP >> drives, and CDs ... all of which have proven to have a very short >> life span. I've no relevant experience, but I've got some hunches for your consideration. First, if floppies, ZIPs, and CDs can't take your environment, then I doubt if high-density tapes will. They should be more reliable, but not so much so that they would work very well where other media is rotting like meat. Second, I suspect that those temperatures would not be a problem if the humidity could be kept low. AIUI, media plastic can absorb a bit of water, causing it to expand. If you can't manage a refrigeration- based dehumidifier, maybe the "Dri-Z-Air"-type granules would do the job if you keep the tape drive and tape storage confined to tight boxes big enough to hold well-maintained granule holders. Third, are you being careful to ensure that the tapes have had several hours before use at the same temperature (and maybe days at the same humidity) as they will have when used? Changes in the media might be the real problem. Forth, along the same lines, at those temps, maybe your drives are getting hot enough to cause the media to change temp too much as they are being used. Try putting some strong blowers on your drives to keep them near room temp. Again, I'm just thinking out loud, in case you haven't considered some of that.