Date: Fri, 15 Aug 1997 12:58:23 +0100 From: Hansel Kwok <h.kwok@ic.ac.uk> To: aic7xxx@freebsd.org Subject: System hangs with unrecoverable SCSI bus or device hang. Message-ID: <199708151158.MAA19379@uranus.ee.ic.ac.uk>
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Hi, I have a problem relating to my Cyrix 6x86 200+ and Adaptec 2940 SCSI adaptor. System Config: Cyrix 686 P200+ AHA 2940 SCSI Adaptor 48M RAM Segate 2GB SCSI Harddisk (scsi id 0) SCSI CDROM (scsi id 1) Linux apache.gih.co.uk 2.0.20 #8 Tue Jul 8 00:02:31 BST 1997 i486 Problem: When there is heavy access to my scsi disk, the system hangs with the following messages. ---- aborting command due to time out (pid 1126) scsi0 channel 0 id0 lun0 0x28 00 00 2a 2b d6 00 00 72 00 (abort) Aborting scb0 TCL 0/0/0 ----- Then the system tries to reset the scsi bus. This is what it thinks... --- SCSI host 0 abort (pid 1126) timed out resetting SCSI bus is being reset for host 0 channel 0 aic7xxxx reset target/channel 0/ 0 abort reset scb state 01 Data-In Phase SCSISIGI 0x44 abort scb asserted ATW - host device reset in message buffer. --- System tried to repeat the reset but with the same results. Then came the following: --- SCSI host 0 reset timed out again probably an unrecoverable SCSI bus or device hang. --- This problem appeared during fsck when the filesystem is unclean. It also appeared when X starts, or some other disk intensive application. Because it is a 6x86 200+, the bus clock is set to 75MHz. When I set the bus clock to that of a 166+, which is 66MHz, the system is fine. I was able to use the system for a long time without problems. When the system hangs, the red led on the scsi card is on constantly. I tried to see if the same problem appeared with NT, well, it did hang for a while with the red LED on, however, NT seems to be able to get out of it. However, I was not able to do a lot of testing with NT. Can someone tell me what the problem might be? Thank you. Hansel. -- Hansel Kwok. Telephone: +44 (0)171 5946309 Digi. Comms. Section, EEED Email: h.kwok@ic.ac.uk Imperial College of Science, : hansel@gih.com Technology and Medicine, London. : hansel@gih.co.uk
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