Date: Fri, 9 Jul 1999 01:19:49 +0100 From: Mark Ovens <markov@globalnet.co.uk> To: The Clark Family <Clark@open.org> 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> In-Reply-To: <199907082224.PAA27606@opengovt.open.org>; from The Clark Family on Thu, Jul 08, 1999 at 03:53:08PM -0700 References: <199907082054.NAA03455@hudsucker.gamespot.com> <199907080218.VAA14937@hostigos.otherwhen.com> <199907082142.QAA16185@hostigos.otherwhen.com> <199907082224.PAA27606@opengovt.open.org>
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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.
> >
> >
> >
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> >
>
>
>
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--
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
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