Date: Tue, 05 Mar 1996 06:38:23 -0800 From: "Justin T. Gibbs" <gibbs@freefall.freebsd.org> To: jmb Cc: freebsd-scsi, freebsd-hardware, freebsd-hackers Subject: Re: Archive Anconda Tape drive 1.35GB Message-ID: <199603051438.GAA28607@freefall.freebsd.org> In-Reply-To: Your message of "Mon, 04 Mar 1996 19:39:25 PST." <199603050339.TAA25127@freefall.freebsd.org>
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>The recommended tape is the 3M Magnus DC-9135. Tech support >recommends that the SCSI controller be configured for 5 MB/s >operation, SYNC disabled, SCSI disconnect=no, and jumper jp6 open. >(the jumper information is wrong. jp6 open == SCSI-1, jp6 shorted >== SCSI-2) The tech doc is available from Connor's fax-back service: >1-408-456-4903 (?) document 2206 (?) (no fax machine here, i will >verify this tomorrow) I think the tech people are off in space. Async maxes out at ~3MB/s, so it doesn't matter what the controller's sync rate is set to. You also want to have disconnection enabled for the driver or it will hand up the SCSI bus for other devices while its doing things like rewinding. Ughh. >When operating as a SCSI-1 device (jp6 open) the drive does not >conform to SCSI-1. The drive "locks" the scsi bus during at least >some mt operations (eg fsf, rewind, rewoffl). This is because it doesn't disconnect correct? >When operating as a SCSI-2 device (jp6 shorted) the drive does not >lock the scsi bus during the operations listed above. However to >get the ncr working with /sbin/dump, the ncr requires a patch >extending the latetime from 10 secs to a larger value. presently >i am using 20 minutes. ;( but it works and its fast! it does >not lock the bus while the dump is being written to tape. What does the latetime value affect? -- Justin T. Gibbs =========================================== FreeBSD: Turning PCs into workstations ===========================================
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