Date: Thu, 27 Mar 1997 10:29:59 -1000 (HST) From: "David Langford" <langfod@dihelix.com> To: thorpej@nas.nasa.gov Cc: arman@bico.co.id, freebsd-hackers@freebsd.org, freebsd-scsi@freebsd.org Subject: Re: DLT exchanger Message-ID: <199703272029.KAA06983@caliban.dihelix.com> In-Reply-To: <199703271913.LAA11872@lestat.nas.nasa.gov> from Jason Thorpe at "Mar 27, 97 11:13:18 am"
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>On Thu, 27 Mar 1997 23:30:19 +0700 (JVT) > Arman Hazairin Hasan <arman@BICO.co.id> wrote: > > > Does any body knows the SCSI control command for DLT exchanger. > > I want to write a script that control the 'arm' of DLT exchanger > > in order to move the cartridge from repository to it's drive. > >If you're using FreeBSD-current, I believe you can use the chio(1) >command if you have the "ch" driver in your kernel. (Can't say for >sure, since I don't run FreeBSD, but I think my driver was finally >committed :-) >Jason R. Thorpe thorpej@nas.nasa.gov Yes, it was!!! :) I never did publicy thank the FreeBSD team for doing this. So, if you guys are reading this THANK YOU!!!! The driver works well on the cheapo 4mm Archive/Seagate drive. The thing that took me awhile to realize was that you had to be very explicit with chio. You cannot tell it to move a tape into the drive and expect it to return the one it already has. Here is the stupid short write-up I did for someone: The thing to keep in mind is that the tape changer is a robot. Robots are dumb. Robots only do what you tell them to. Unlike Douglas Adams you cannot have tape and no-tape at the same time. You cannot hold two tapes in either the tape drive or the tape slot. When tape starts it holds all tapes in holders and none it the drive. Here is me moving tape from the third slot into the drive and back. Then I move tape in the first slot into the drive. Rule of thumb is: chio "from" "to" www /root% chio status picker 0: slot 0: <ACCESS,FULL> slot 1: <ACCESS,FULL> slot 2: <ACCESS,FULL> slot 3: <ACCESS,FULL> drive 0: <ACCESS> www /root% chio move slot 3 drive 0 www /root% chio status picker 0: slot 0: <ACCESS,FULL> slot 1: <ACCESS,FULL> slot 2: <ACCESS,FULL> slot 3: <ACCESS> drive 0: <ACCESS,FULL> www /root% chio move drive 0 slot 3 www /root% chio status picker 0: slot 0: <ACCESS,FULL> slot 1: <ACCESS,FULL> slot 2: <ACCESS,FULL> slot 3: <ACCESS,FULL> drive 0: <ACCESS> www /root% chio move slot 0 drive 0 www /root% chio status picker 0: slot 0: <ACCESS> slot 1: <ACCESS,FULL> slot 2: <ACCESS,FULL> slot 3: <ACCESS,FULL> drive 0: <ACCESS,FULL> -David Langford langfod@dihelix.com
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