Date: Thu, 08 Jul 1999 15:53:08 -0700 From: The Clark Family <Clark@open.org> To: mavery@mail.otherwhen.com, jsd@gamespot.com, freebsd-questions@FreeBSD.ORG Subject: Re: HP T4000s Tape Drive problems Message-ID: <199907082224.PAA27606@opengovt.open.org> In-Reply-To: <199907082142.QAA16185@hostigos.otherwhen.com> References: <199907082054.NAA03455@hudsucker.gamespot.com> <199907080218.VAA14937@hostigos.otherwhen.com>
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Mike, The HP stuff is 4mil isn't it? If so, DAT is 8mil right? So HP isn't DAT its 4mil. 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
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