Date: Wed, 4 Nov 1998 23:16:26 -0500 (EST) From: Nick Wilhelm-Olsen <wilhelm@milkyway.stdio.com> To: freebsd-questions@FreeBSD.ORG Subject: SDT-7000 density woes Message-ID: <199811050416.XAA07609@terra.milkyway.stdio.com>
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Hello, This may be a FAQ, but I don't think so. I looked all over the archives for anything similar and couldn't find it. I am running 3.0-RELEASE on Compaq EISA box with a fairly stock kernel, using an Adaptec 2742 (ahc) for SCSI. I have a Sony SDT-7000 DDS-2 4mm tape drive attached to the system that properly shows up as sa0. ...<snip>... ahc0: <Adaptec 274X SCSI host adapter> at 0x4c00-0x4cff irq 11 on eisa0 slot 4 ahc0: aic7770 >= Rev E, Twin Channel, A SCSI Id=7, B SCSI Id=7, primary A, 4/255 SCBs ..<snip>... Waiting 15 seconds for SCSI devices to settle sa0 at ahc0 bus 0 target 4 lun 0 sa0: <SONY SDT-7000 0215> Removable Sequential Access SCSI2 device sa0: 10.0MB/s transfers (10.0MHz, offset 15) My first attempt at dumping to the tape device worked ok, except for the fact that I ran out of tape well before I should have, before writing 2G to the device. I immediately smacked myself for forgeting to set the density to DDS-2 and enable compression (mode 0x24 from mt(1)): # mt -f /dev/nrsa0 density 0x24 mt: /dev/nrsa0: density: invalid argument (sa0:ahc0:0:4:0): MODE SELECT(06). CDB: 15 0 0 0 c 0 (sa0:ahc0:0:4:0): ILLEGAL REQUEST asc:26,0 (sa0:ahc0:0:4:0): Invalid field in parameter list sks:8f,4 Sure enough, I check the densities that the device thinks that it supports and 0x24 is not listed: # mt -f /dev/nrsa0 status Mode Density Blocksize bpi Compression Current: X3B5/88-185A 512 bytes 61000 DCLZ ---------available modes--------- 0: X3B5/88-185A 512 bytes 61000 DCLZ 1: X3B5/88-185A 512 bytes 61000 DCLZ 2: X3B5/88-185A 512 bytes 61000 DCLZ 3: X3B5/88-185A 512 bytes 61000 DCLZ What?!? Why does the sa device only think that DDS is supported? What is wrong here? Is this a fundamental user error or something else? Please help as I am now officially quite confused. --Nick To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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