From owner-freebsd-scsi Sat Jul 4 01:32:00 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id BAA27701 for freebsd-scsi-outgoing; Sat, 4 Jul 1998 01:32:00 -0700 (PDT) (envelope-from owner-freebsd-scsi@FreeBSD.ORG) Received: from iclub.nsu.ru (iclub.nsu.ru [193.124.222.66]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id BAA27668 for ; Sat, 4 Jul 1998 01:31:48 -0700 (PDT) (envelope-from semen@iclub.nsu.ru) Received: from localhost (semen@localhost) by iclub.nsu.ru (8.8.8/8.8.5) with SMTP id PAA28320; Sat, 4 Jul 1998 15:34:29 +0700 (NSS) Date: Sat, 4 Jul 1998 15:34:28 +0700 (NSS) From: Ustimenko Semen To: David Kelly cc: Harlan Stenn , dc-sage@dc-sage.org, scsi@FreeBSD.ORG, amanda-users@cs.umd.edu Subject: Re: DDS/2 tape specs In-Reply-To: <199807032016.PAA21647@nospam.hiwaay.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org 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