Date: 11 May 1999 02:59:14 -0500 From: stephen farrell <stephen@farrell.org> To: freebsd-scsi@freebsd.org Subject: Problems after adding CD (CRW4416S) Message-ID: <coubtfsuje5.fsf@couatl.cs.uchicago.edu>
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Since adding a CD-RW (Yamaha CRW4416S), I have been having major problems with my SCSI bus. In fact, I have resigned to disconnecting the CD until I can figure out the problem. Here is the problem: SCSI timeouts either on boot or shortly after we have some disk load. Here is the setup: FreeBSD 3.1-STABLE #6: Mon Apr 26 12:30:18 CDT 1999 CPU: Pentium II/Xeon/Celeron (400.91-MHz 686-class CPU) ASUS P2B-D motherboard w/BX chipset (only one cpu) ahc0: <Adaptec 2940A Ultra SCSI adapter> rev 0x01 int a irq 10 on pci0.11.0 ahc0: aic7860 Single Channel A, SCSI Id=7, 3/255 SCBs [adaptec bios revision 1.30] da1 at ahc0 bus 0 target 1 lun 0 da1: <CONNER CFP2105S 2.14GB 172A> Fixed Direct Access SCSI-2 device da1: 10.000MB/s transfers (10.000MHz, offset 15), Tagged Queueing Enabled da1: 2048MB (4194304 512 byte sectors: 255H 63S/T 261C) da2 at ahc0 bus 0 target 2 lun 0 da2: <SEAGATE ST39173N 5764> Fixed Direct Access SCSI-2 device da2: 20.000MB/s transfers (20.000MHz, offset 15), Tagged Queueing Enabled da2: 8683MB (17783240 512 byte sectors: 255H 63S/T 1106C) da0 at ahc0 bus 0 target 0 lun 0 da0: <SEAGATE ST34501N 0017> Fixed Direct Access SCSI-2 device da0: 20.000MB/s transfers (20.000MHz, offset 15), Tagged Queueing Enabled da0: 4339MB (8887200 512 byte sectors: 255H 63S/T 553C) cd0 at ahc0 bus 0 target 6 lun 0 cd0: <YAMAHA CRW4416S 1.0f> Removable CD-ROM SCSI-2 device cd0: 8.333MB/s transfers (8.333MHz, offset 15) cd0: cd present [191788 x 2048 byte records] All drives are mounted internally. There is one cable, it is adaptec brand, and it has 4 connectors (+ host). da0 (the cheetah) is the last drive on the chain. It has termination turned on with the jumper (on j2, there are jumpers in location 2 and 8, which correspond to term power from drive and term enabled, respectively); all other drives have termination turned off. I've tried a number of different arrangements of the bus, but the one which works the best seems to be CD -> da2 -> da1 -> da0. I was able to get this setup to run for a while (with the CD) by fiddling with the adaptec bios setup utility. I disabled Ultra SCSI on the CDROM only, and set its transfer speeds down to 5MB/sec. This seemed to work, but it made the rest of the drives awfully slow. (Presumably they too were running at 5MB/sec?) It seems that with any other settings, it is guaranteed to have SCSI timeouts, often during fsck at boot. If I remove the CD all problems go away. (This is my current state). I cannot imagine that it would be so much trouble to add a CDROM. Can anyone suggest what I might try to fix this problem? Thanks for any help! -- Steve Farrell To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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