Date: Wed, 16 Dec 1998 11:35:00 +0000 From: Richard Smith <richard@jezebel.demon.co.uk> To: "Justin T. Gibbs" <gibbs@narnia.plutotech.com> Cc: scsi@FreeBSD.ORG Subject: Re: Update: ncr0: timeout problem Message-ID: <36779AE4.18B06075@jezebel.demon.co.uk> References: <199812152117.OAA59717@narnia.plutotech.com>
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Justin T. Gibbs wrote: > > > Over a month ago, I posted a timeout problem I was having with my > > symbios controller and fujitsu drive, on 2.2.7R > > > > I have now upgraded to 3.0R and the problem although different, still > > remains. I was advised at the time that the problem would be easier to > > diagnose under 3.0, so here goes... > > My guess would be that the Fujitsu doesn't like getting lots of tags. > CAM will actually send more transactions to the drive in parallel than > the old SCSI code which could be making the problem worse than before. > Unfortunately, my knowledge of the underlying NCR hardware is pretty > limitted, so I can't say for sure that this is the cause of the problem. > > Try reducing the number of transactions that CAM sends to the drive > and see if this helps. You can do this by adding a quirk entry > for your drive in sys/cam/cam_xpt.c. Something like this should get > you started: > > { > /* Broken tagged queuing drive?? */ > { T_DIRECT, SIP_MEDIA_FIXED, "FUJITSU", "M2949E-512", "0134" }, > /*quirks*/0, /*mintags*/2, /*maxtags*/2 > }, > > If this works, increment the maxtags value until it stops working. :-( I successfully managed to reduce the number of timeout messages to two: ncr0: timeout nccb=0xf0857400 ncr0: timeout nccb=0xf085f800 So I guess the quirk entry was correctly picked up, but did not cure the problem. Thanks for your support. -richard _______________________________________________________________________ Richard Smith Assistant Chief Engineer TRL Technology Limited To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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