Date: Tue, 29 Sep 1998 15:58:51 -0500 From: Karl Denninger <karl@Denninger.Net> To: mikebo@tellabs.com Cc: Mike Borowiec <mikebo@Genesis.Denninger.Net>, hackers@FreeBSD.ORG Subject: Re: Exabyte 8500 in low density (2GB) mode... How? Message-ID: <19980929155851.A1674@Denninger.Net> In-Reply-To: <9809292054.AA25720@tellabc.tellabs.com>; from mikebo@tellabs.com on Tue, Sep 29, 1998 at 03:54:56PM -0500 References: <19980929142441.A1359@Denninger.Net> <9809292054.AA25720@tellabc.tellabs.com>
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Have you tried "mt status" and then "mt mode" to set the mode which corresponds? -- Karl On Tue, Sep 29, 1998 at 03:54:56PM -0500, mikebo@tellabs.com wrote: > Karl - > Yes, the 8500 can write in 8200 format - I do it all the time on Suns. > I just don't know how to do it on FreeBSD, or if it is even possible. > > The Solaris mechanism to select density is to write to the correct > device. For example, given the following BSD compatibility devices: > > > ls -l /dev/rst* > lrwxrwxrwx 1 root 7 Jan 12 1998 /dev/rst11 -> rmt/0lb > lrwxrwxrwx 1 root 7 Jan 12 1998 /dev/rst19 -> rmt/0mb > lrwxrwxrwx 1 root 7 Jan 12 1998 /dev/rst27 -> rmt/0hb > lrwxrwxrwx 1 root 7 Jan 12 1998 /dev/rst35 -> rmt/0cb > > If I write to /dev/rst11 (aka. /dev/rmt/0lb) it writes to the Exabyte > 8500 known as /dev/rmt/0 in (l)ow density (8200 format), using the > (b)erkeley style tapemarks. > > Regards, > - Mike > > > > > I don't believe an 8500 CAN write 8200 format. > > > > It can READ 8200 format, but not write it. There are differences in track > > density and head gap size, and as such I don't believe this is even > > physically possible. > > > > -- > > -- > > Karl Denninger (karl@denninger.net) http://www.mcs.net/~karl > > I ain't even *authorized* to speak for anyone other than myself, so give > > up now on trying to associate my words with any particular organization. > > > > "Yes, the president should resign. He has lied to the American people, > > time and time again, and betrayed their trust. Since he has > > admitted guilt, there is no reason to put the American people through > > an impeachment. He will serve absolutely no purpose in finishing out > > his term, the only possible solution is for the president to save > > some dignity and resign." > > ________________________________________________________________________ > > > > 12th Congressional District Hopeful William Jefferson Clinton, > > during the Nixon investigations > > > > > > On Tue, Sep 29, 1998 at 01:14:06PM -0500, mikebo@tellabs.com wrote: > > > Greetings - > > > Does anyone know how to write to an Exabyte 8500 in low density mode > > > (2GB format)? The Exabyte 8500 tape drive default is 5GB format, which > > > cannot be read by the old Exabyte 8200 2GB drive. > > > > > > In Solaris there is a seperate device node for each density (lo, med, hi). > > > However, in FreeBSD, I believe one has to send an IOCTL to the driver via > > > an external command - but what is it? > > > > > > I've tried reading the st() and mt() man pages, and posting to the > > > "questions" list, but I can't find any "how to" information on this. > > > Any help would be appreciated. > > > Regards, > > > - Mike > > > -- > > > -------------------------------------------------------------------------- > > > Michael Borowiec -- mikebo@tellabs.com -- Tellabs Operations, Inc. > > > Systems Analyst, Corporate Software Tools 4951 Indiana Ave., MS 63 > > > 630-512-8019 FAX: 630-512-7099 Lisle, IL 60532 USA > > > -------------------------------------------------------------------------- > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > > with "unsubscribe freebsd-hackers" in the body of the message > > > > > -- > -------------------------------------------------------------------------- > Michael Borowiec -- mikebo@tellabs.com -- Tellabs Operations, Inc. > Systems Analyst, Corporate Software Tools 4951 Indiana Ave., MS 63 > 630-512-8019 FAX: 630-512-7099 Lisle, IL 60532 USA > -------------------------------------------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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