Date: Sat, 19 Dec 1998 10:46:05 -0800 (PST) From: Gary Kline <kline@tera.com> To: dkelly@hiwaay.net (David Kelly) Cc: kline@tera.com, questions@FreeBSD.ORG Subject: Re: 4mm tape drive question Message-ID: <199812191846.KAA21155@athena.tera.com> In-Reply-To: <199812190635.AAA10607@n4hhe.ampr.org> from David Kelly at "Dec 19, 98 00:35:52 am"
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According to David Kelly: > Gary Kline writes: > > > > > > When I bought my 4mm tape drive in '95, 2GB was a _lot_ > > of storage; but since I've just added a 9G drive to > > my main system, it's time to consider the backups. > > > > My question: can I use a cassette larger than 90meter > > ones I've been using? (And why?) > > Don't know what brand and model 4mm drive you have so we can't answer. > But if you have a DDS-1 drive you are limited to the 60m and 90m tapes. > All but the earliest DDS drives are smart enough to know what tape you > put it, or at least smart enough to know if they were designed to use > the tape you inserted. > > 120m DDS-2 tapes "only" do a native 4G. But only on DDS-2 drives. > > 125m DDS-3 tapes do a native 12G. I wonder if these tapes are really 5m > longer than DDS-2 or somebody in marketing just fudged the numbers? > > A good solution for now would be to use the -z option in FreeBSD's GNU > tar. You'll get some useful compression if you use tar. I had the box custom built and have prob'ly lost the docs after 40+ months, so I'm betting that the 4mm was the cheapest (even at $550) that the place could use. As for gzip, I've used it (unnecessarily) and recovered everything succesfully. I need to buy a second tape drive (4mm or 8mm) for sage and tar | dd across my net. ...The good news, of course, is that I'm never (?!) going to have 11G of data to backup. > > Otherwise partition the drive in chunks small enough to fit on your > tapes in order to enforce a segregation for backup. > I followed Greg L's advice here. The entire 9G will be /usr. gary To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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