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Date:      Tue, 01 Dec 1998 19:13:06 -0500
From:      Adam McDougall <bsdx@spawnet.com>
To:        scsi@FreeBSD.ORG
Subject:   Re: tosha reports random errors after transition to CAM
Message-ID:  <36648612.693004F7@spawnet.com>
References:  <199812011845.LAA21068@panzer.plutotech.com>

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Kenneth D. Merry wrote:
> 
> Adam McDougall wrote...
> > I think I notice the same thing too. (well, similar)
> > It started happening when I changed HD's from a Atlas II to a Viking UW.
> 
> That could be your problem...I'll explain below.

> > (da0:dpt0:0:0:0): READ(06). CDB: 8 2 9 b0 28 0
> > (da0:dpt0:0:0:0): ILLEGAL REQUEST asc:24,0
> > (da0:dpt0:0:0:0): Invalid field in CDB field replaceable unit: 80
> > sks:c0,9
> 
> This is rather bizzare, since the drive is complaining about byte 9 of a 6
> byte CDB.
> 
> Justin suspects that the drive may not be handling 6-byte reads and writes
> properly.
> 
> > dpt0: <DPT Caching SCSI RAID Controller> rev 0x02 int a irq 12 on
> > pci0.17.0
> > dpt0: DPT PM2144UW FW Rev. 07LY, 1 channel, 64 CCBs
> > da0: <QUANTUM VIKING 4.5 WSE 8808> Fixed Direct Access SCSI2 device
> > da0: Tagged Queueing Enabled
> > da0: 4345MB (8899736 512 byte sectors: 255H 63S/T 553C)
> 
> Try this --  go into sys/cam/scsi/scsi_da.c, and on about line 1079, adjust
> the minimum_cmd_size for the read and write commands to 10 bytes.
> 

THANK YOU!!!! works PERFECT now :) 

So, what does this mean the problem might be? 

> It could be that the disk isn't handling 6-byte reads and writes.  It could
> also be some problem with the DPT driver, or the DPT firmware.  (Simon
> would probably have a better idea on this one.)  I suspect, though, that
> it may be a drive firmware problem.
> 
> Ken
> --
> Kenneth Merry
> ken@plutotech.com

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