From owner-freebsd-questions Thu Jul 8 17:24:27 1999 Delivered-To: freebsd-questions@freebsd.org Received: from sand5.global.net.uk (sand5.global.net.uk [194.126.80.249]) by hub.freebsd.org (Postfix) with ESMTP id 856B2155AC for ; Thu, 8 Jul 1999 17:24:21 -0700 (PDT) (envelope-from marko@globalnet.co.uk) Received: from p77s10a06.client.global.net.uk ([195.147.218.120] helo=marder-1.) by sand5.global.net.uk with esmtp (Exim 2.05 #1) id 112OSb-0002gT-00; Fri, 9 Jul 1999 01:24:14 +0100 Received: (from marko@localhost) by marder-1. (8.9.2/8.8.8) id BAA00300; Fri, 9 Jul 1999 01:19:49 +0100 (BST) (envelope-from marko) Date: Fri, 9 Jul 1999 01:19:49 +0100 From: Mark Ovens To: The Clark Family Cc: mavery@mail.otherwhen.com, jsd@gamespot.com, freebsd-questions@FreeBSD.ORG Subject: Re: HP T4000s Tape Drive problems Message-ID: <19990709011948.A254@marder-1> References: <199907082054.NAA03455@hudsucker.gamespot.com> <199907080218.VAA14937@hostigos.otherwhen.com> <199907082142.QAA16185@hostigos.otherwhen.com> <199907082224.PAA27606@opengovt.open.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.3i In-Reply-To: <199907082224.PAA27606@opengovt.open.org>; from The Clark Family on Thu, Jul 08, 1999 at 03:53:08PM -0700 Organization: Total lack of Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thu, Jul 08, 1999 at 03:53:08PM -0700, The Clark Family wrote: > Mike, > The HP stuff is 4mil isn't it? If so, DAT is 8mil right? > So HP isn't DAT its 4mil. > DAT is 4mm. 8mm? are you sure you're not thinking of Exabyte? HP make DAT drives as well. > My theory is, if your servers can't keep up a stream of data > sufficient to keep a DLT7000 streaming, then you need to rethink > how you build servers. > > If you go with multiple 4000s, get three so you can stripe across > them. > (grin) > > [RC] > > At 04:39 PM 7/8/99 -0500, Mike Avery wrote: > >On 8 Jul 99, at 13:54, Jon Drukman wrote: > > > >> >I've resolved backup problems in several shops by just ditching the > >> >Travan drives. These weren't the cheapos, they were the "professional" > >> >NS-8 and NS-20 series drives. > > > >> Based on what you and a few others have said about general Travan > >> crappiness, I will follow your advice and put this thing back in > >> the cupboard from whence it came, and instead play around with > >> this Exabyte 8500 I found. > > > >> On a somewhat related note, does anybody have any strong preferences > >> between DAT/DLT/Exabyte? I'm interested in all experiences, good or > >> bad... Let me know. > > > >I have an ExaByte 8505XL, and I'm very happy with it, overall. It's > >fairly quick, good capacity, and I can usually use commercial (video) > >8mm tapes in it and save money. It's big drawback is that it's seek > >time is a LOT longer than that of a DAT or DLT. I don't know that > >I'd buy another one if this one died, but I am happy with it, and I do > >trust it. > > > >I've used more than a few DAT drives. I like Archive and Seagate a > >lot. I can live with HP. The HP's seem to flake out and need to be > >overhauled. Things might have gotten better since I stopped using > >them... I wouldn't know about that. I've had good luck with, and > >heard good reports on, the Seagate 12/24 gig DAT drive.... the > >Scorpion I think. > > > >As to DLT drives, I've used 'em, but not often. A bit rich for my > >blood. Those who use 'em seem to love 'em. Very fast. However, > >be aware that there are only two drive manufacturers now. > >Quantum and Tandberg. If it doesn't say Tandberg, it's a > >Quantum. (As far as I know, Tandberg isn't OEM'ing yet.) > >Quantum's are good drives, so the point isn't "avoid quantum", it's > >"don't pay more than you have to, they're all the same damn drive". > > > >Another consideration.... the 4000 series is rated at about 1.5mbps. > >The 7000 at about 5... if memory serves. Many servers (your > >hardware, backup software, server load, and OS will cause the > >mileage to vary) can't deliver a byte stream fast enough to keep a > >7000 series drive in streaming mode, so it goes into start-stop mode. > > This destroys the throughput.... slower than a 4000 series drive in > >practice. So, unless you are VERY sure you have the bandwidth (and > >more than one person has been surprised here), stay with a 4000 > >series drive. Or two 4000 series drives for more capacity. > > > >Hope this helps, > >Mike > > > >====================================================================== > >Mike Avery MAvery@mail.otherwhen.com > > (409)-842-2942 (work) > > ICQ: 16241692 > > > >* Spam is for lusers who can't get business any other way * > > > >A Randomly Selected Thought For The Day: > >Oft-times thou feelest like unto a nut, > >And yet, M'lord, anon, feel'st thou not so. > >Yon Almond Joy these selfsame nuts doth have. > >Whereas contrary Mounds doth have them not. > > > > > > > >To Unsubscribe: send mail to majordomo@FreeBSD.org > >with "unsubscribe freebsd-questions" in the body of the message > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message > -- FreeBSD - The Power To Serve http://www.freebsd.org My Webpage http://www.users.globalnet.co.uk/~markov _______________________________________________________________ Mark Ovens, CNC Apps Engineer, Radan Computational Ltd. Bath UK CAD/CAM solutions for Sheetmetal Working Industry mailto:markov@globalnet.co.uk http://www.radan.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message