Date: Sun, 5 Dec 1999 13:37:04 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: "Jordan K. Hubbard" <jkh@zippy.cdrom.com> Cc: Dan Seguin <dseg@texar.com>, Bill Fumerola <billf@chc-chimes.com>, "Ronald F. Guilmette" <rfg@monkeys.com>, freebsd-hackers@FreeBSD.ORG Subject: Re: Strange SCSI sickness Message-ID: <Pine.BSF.4.10.9912051332220.28920-100000@beppo.feral.com> In-Reply-To: <44943.944427579@zippy.cdrom.com>
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> 3. Any system I saw spitting out errors like this would get the following > treatment, in roughly this order: > > 3a) Complete check of all cables and the seating of connectors. > > 3b) Examination of the drive(s) in question for any cooling or > mounting deficiencies. Depending on the SCSI errors in question, > I might even investigate firmware updates for the drive(s). > > 3c) Examination of the controller for correct seating and bus slot > (in older PCI mobos, this makes a difference) as well as its > firmware revision level. > 3d) Any system experiencieng scsi parity errors should have all components power cycled (for self healing termpwr- fuses) and any pluggable termpwr fuses checked (these are exceedingly rare now- but if you had a SparcStation, they'd be the first thing to check- they're next to the ethernet connector on the motherboard). If you're not using an active terminator, you should be. Check for multiple termination- both ends of the bus must have termination enabled, nothing else- check drive and hba. If necessary, derate off of Ultra to Fast to see if this was the source of problems. [ a parity error indicates trashed signals. a parity error in data phase indicates signal reflection, skew, or rise time problems. signal quality is greatly affected by: bus length, termination, cable impedance mismatches ] To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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