From owner-freebsd-hackers Tue Aug 11 17:12:56 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id RAA04848 for freebsd-hackers-outgoing; Tue, 11 Aug 1998 17:12:56 -0700 (PDT) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from allegro.lemis.com (allegro.lemis.com [192.109.197.134]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id RAA04826; Tue, 11 Aug 1998 17:12:42 -0700 (PDT) (envelope-from grog@freebie.lemis.com) Received: from freebie.lemis.com (freebie.lemis.com [192.109.197.137]) by allegro.lemis.com (8.9.1/8.9.0) with ESMTP id JAA15199; Wed, 12 Aug 1998 09:42:16 +0930 (CST) Received: (from grog@localhost) by freebie.lemis.com (8.9.1/8.9.0) id JAA25142; Wed, 12 Aug 1998 09:42:15 +0930 (CST) Message-ID: <19980812094215.L22754@freebie.lemis.com> Date: Wed, 12 Aug 1998 09:42:15 +0930 From: Greg Lehey To: Wilko Bulte , David Kelly Cc: se@FreeBSD.ORG, pvh@leftside.wcape.school.za, freebsd-hackers@FreeBSD.ORG Subject: Re: EXA 8200 tape drive on FreeBSD? References: <199808110035.TAA00818@nospam.hiwaay.net> <199808111816.UAA01048@yedi.iaf.nl> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.91.1i In-Reply-To: <199808111816.UAA01048@yedi.iaf.nl>; from Wilko Bulte on Tue, Aug 11, 1998 at 08:16:58PM +0200 WWW-Home-Page: http://www.lemis.com/~grog Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-41-739-7062 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Tuesday, 11 August 1998 at 20:16:58 +0200, Wilko Bulte wrote: > As David Kelly wrote... >> Stefan Esser writes: >>> On 1998-08-09 17:32 +0200, Peter van Heusden w >>> rote: >>>> However, I cannot write to it at all - even after a 'mt erase', I get the >>>> following: >>>> >>>> bash# mt rewind >>>> bash# dd if=/kernel of=/dev/nrst0 bs=64 count=1024 >>>> dd: /dev/nrst0: Input/output error >>>> 1+0 records in >>>> 0+0 records out >>>> 0 bytes transferred in 0.082043 secs (0 bytes/sec) >>>> bash# > > On mine: > > su-2.01# dd if=/kernel of=/dev/nrst1 bs=64 count=1024 > 1024+0 records in > 1024+0 records out > 65536 bytes transferred in 5.187031 secs (12635 bytes/sec) > su-2.01# > > Why you want to use 64 byte blocks escapes me because: > > su-2.01# dd if=/kernel of=/dev/nrst1 bs=64k count=1024 > 17+1 records in > 17+1 records out > 1176833 bytes transferred in 11.385549 secs (103362 bytes/sec) > > A 8200 native speed is something like 240kb/sec if I remember well. Right. Measuring something as small as a kernel is not a good way to measure Exabyte speed, because the things spend an eternity to decide whether they're going to start or not. Greg -- See complete headers for address and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message