Date: Wed, 13 May 1998 09:53:45 -0400 (EDT) From: Mik Firestone <fireston@lexmark.com> To: gibbs@narnia.plutotech.com (Justin T. Gibbs) Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: SCSI timeouts in dataout mode Message-ID: <199805131353.AA11660@interlock2.lexmark.com> In-Reply-To: <199805121725.LAA02342@narnia.plutotech.com> from "Justin T. Gibbs" at "May 12, 98 11:25:57 am"
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In a fit of madness, Justin T. Gibbs wrote > > Is this only with multi-lun I/O, or can you make this happen just by > touching one lun? Does the HP have a status monitor? If so, what does > it say? The problem occurs with only one LUN or many. The HP does not have a status monitor that we can access, although the blinky lights on the front of the unit are quite hypnotic. > > Do you have access to a SCSI bus analyzer? Yes, and we will be using that tomorrow (our normal duties have gone ignored a bit too long ). I have no clue how to read the output from such a beast - what should we be looking for? > What does a boot -v tell you about the termination of the card? Does it > appear to be correct? Does the behavior change if you use a manual > terimination setting in SCSI-Select? boot -v was difficult. CAM in verbose mode spits a lot of data out and we kept blowing the 8K buffer. We tweaked the buffer to 16K ( shouldn't that be a config option w/ necessary sysctl parameter? ) and the card is terminated correctly. Changing those parameters seemed to have no effect. I will make the observation that this error is somehow related to the amount of time it takes to write the file. If it takes more then 10 seconds to write, we see this error. We have not yet tried to read a large file to see what problems that can cause. To hazard a guess, I really think this is some strange interaction between the scsi code and the cache on the HP. Either the HP is doing the right kind of handshaking or the FreeBSD box is missing it. But this is only a guess. -- Mik Firestone fireston@lexmark.com If ever I become an Evil Overlord: All naive, busty tavern wenches in my realm will be replaced with surly, world-weary waitresses who will provide no unexpected reinforcement and/or romantic subplot for the hero or his sidekick. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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