Date: Sat, 4 Jul 1998 15:34:28 +0700 (NSS) From: Ustimenko Semen <semen@iclub.nsu.ru> To: David Kelly <dkelly@hiwaay.net> Cc: Harlan Stenn <Harlan.Stenn@pfcs.com>, dc-sage@dc-sage.org, scsi@FreeBSD.ORG, amanda-users@cs.umd.edu Subject: Re: DDS/2 tape specs Message-ID: <Pine.BSF.3.96.980704152249.28181A-100000@iclub.nsu.ru> In-Reply-To: <199807032016.PAA21647@nospam.hiwaay.net>
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On Fri, 3 Jul 1998, David Kelly wrote: > Harlan Stenn writes: > > My second test took 8191 `y' characters followed by a newline: > > > > % yes `cat 8ky` | dd bs=8k of=/dev/rst0 > > > > and I eventually killed after over 24 hours' elapsed time. > > When I killed it, I think it claimed to have written nearly 10G to the tape. > > 24 hrs for only 10G doesn't sound good. > > To a similar DDS-2 (with compression) drive I once used dd to copy > /dev/null until something broke. Got 88G on a DDS-1 90m tape. Took > about 8 hours. SGI Indy R5000, Irix 6.2, OEM SGI/Seagate/Archive DDS-2 > tape drive. > Yes, in good times it writes real fs data on 500-800 Kb/s. But in worst, it goes on 20-80 Kb/s :-( Else total capacity and speed decrease after you use tape many times without eraseing it and/or cleaning drive's head. IMHO there are linear dependence between data speed and cartridge capacity (becouse the tape speed is fixed). I'm useing SDT-7000 under 2.2.6-stable. And i can't say: `It works perfectly!` :-( To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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