Date: Mon, 04 Aug 2003 14:24:18 -0600 From: Scott Long <scottl@freebsd.org> To: Wilko Bulte <wkb@freebie.xs4all.nl> Cc: "'aic7xxx@freebsd.org'" <aic7xxx@freebsd.org> Subject: Re: AIC7902 SCSI aborted command Message-ID: <3F2EC0F2.4040605@freebsd.org> In-Reply-To: <20030804201445.GE13405@freebie.xs4all.nl> References: <FE045D4D9F7AED4CBFF1B3B813C8533702742114@mail.sandvine.com> <20030804201445.GE13405@freebie.xs4all.nl>
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Wilko Bulte wrote: > On Mon, Aug 04, 2003 at 04:10:15PM -0400, Don Bowman wrote: > >>From: Justin T. Gibbs [mailto:gibbs@scsiguy.com] >> >>>>After ~200 hours of operation a PC spit out this message: >>>> >>>>Copied 18 bytes of sense data offset 12: 0xf0 0x0 0xb 0x0 >>> >>>0x0 0x40 0xff 0xa >>> >>>>0x0 0x0 0x0 0x0 0x47 0x3 0x8 0x0 0x0 0x0 >>>>(da0:ahd0:0:0:0): WRITE(06). CDB: a 0 40 ff 80 0 >>>>(da0:ahd0:0:0:0): ABORTED COMMAND info:40ff asc:47,3 >>>>(da0:ahd0:0:0:0): Reserved ASC/ASCQ pair field replaceable unit: 8 >>>> >>>>The system has a single U320 15KRPM seagate 18GB drive in it. >>>>No other messages are present. >>> >>>This means that the target saw a CRC miscompare on a packet. CAM >>>retried the command and it succeeded. CRC errors are not unheard >>>of in U320 configurations, but at only 200 hours of load, that is >>>a little too often for comfort. >>> >>>I believe you mentioned before that you were using an extremely >>>short cable in one of your configurations. Be aware that there >>>is a minimum cable length suggested by the SCSI spec. This >>>varies depending on the capacitance rating of your cable, but >>>the shortest length allowed is 10cm (cables with less capacitance >>>need larger spacing). If your cable is shorter than this, you might >>>consider trying something longer. >> >>Me & my trusty ruler re-measured the cable, and straightened out, >>it is 10.4" tip to tail, which matches the spec. I was foolishly >>thinking of the folded length. > > > It isn't too folded I hope? In the sense that you sometimes > find flatcables stashed in miniscule cutouts in cases etc. Not > too good for signal integrity either. > Except in cases where you need to slip through a tight slot and only a flat cable will do, the new-fangled round u320 cables are superior to their flat counterparts. Scott
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