Date: Mon, 17 Jul 1995 11:06:46 -0600 From: kelly@fsl.noaa.gov (Sean Kelly) To: questions@freebsd.org Subject: SCSI DAT tape acting funny; insanity predicted Message-ID: <9507171706.AA27607@emu.fsl.noaa.gov>
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Okay, what's going on? In 2.0R, I was able to reliably make backups using dump(8) to a Wangtek 6130-HS DAT drive. In 2.0.5R, it happens successfully about once out of every 40 times. Seriously. I'm starting to get nightmares about system crashes but with no backup media with which to recover. I've tried isolating the drive on the SCSI bus, booting with a tape in the drive, booting with no tape, trying fixed and variable block sizes, trying various magic tricks to kick-start the driver (mt status before, after, or before and after loading the tape; mt rew instead of mt status, etc.) The problems I see, in order of decreasing frequency: * Premature end of tape detected by dump immediately after starting the dump, occasionally accompanied by console messages saying `invalid request, must be between 0 and 0'. * System hangs; requires RESET button to reboot. * Premature end of tape detected by dump some number of blocks into the dump. Here's dmesg info for the SCSI probe phase: bt0: Bt946C/ 0-PCI/EISA/VLB(32bit) bus bt0: reading board settings, busmastering, int=15 bt0: version 4.22, sync, parity, 32 mbxs, 32 ccbs bt0: targ 0 sync rate= 5.00MB/s(200ns), offset=15 bt0: targ 5 async bt0: Enabling Round robin scheme bt0 at 0x334 irq 15 on isa (bt0:0:0): "CIPHER ST150S2/90 2.2Q" type 1 removable SCSI 2 st0(bt0:0:0): Sequential-Access density code 0x0, drive empty (bt0:5:0): "WANGTEK 6130-HS 4B18" type 1 removable SCSI 2 st1(bt0:5:0): Sequential-Access density code 0x13, drive empty Is the WangTek 6130 another so-called rogue? If so, what should I do about it? If not, what should I do about it? Note that dumps to the Cipher ST150S2/90 work fine. And, after some contrived combinations of power cylcing, booting, and mt commands, I can, once in a blue moon, do a dump to the DAT drive. Signed, Panicky. -- Sean Kelly NOAA Forecast Systems Lab, Boulder Colorado USA To me, boxing is like a ballet, except there's no music, no choreography, and the dancers hit each other. -- Jack Handey
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