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Date: Mon, 19 Jan 2004 05:29:18 -0800 (PST)
From: Don Lewis <truckman@FreeBSD.org>
To: mjs@cc.tut.fi
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cc: freebsd-current@FreeBSD.org
Subject: Re: 5.2R: panic (syncer) on IBM x345 (SMP and Vinum)
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On 19 Jan, Matti Saarinen wrote:
> Don Lewis <truckman@freebsd.org> writes:
> 
>>> (da0:ahd0:0:0:0): Retrying Command
>>> (da0:ahd0:0:0:0): Queue Full
>>> (da0:ahd0:0:0:0): tagged openings now 128
>>> (da0:ahd0:0:0:0): Retrying Command
>>
>> Try using the camcontrol modepage command to turn off write caching
>> on each of the drives (set the WCE bit to 0).
> 
> 
> I hope I've understood the output of the camcontrol command correctly.
> The WCE bit is already set zero for all the devices connected to ahd0.
> 
> # camcontrol modepage da0 -l
> 0x01    Read-Write Error Recovery Page
> 0x02    Disconnect-Reconnect Page
> 0x03    Format Device Page
> 0x04    Rigid Disk Drive Geometry Page
> 0x07    Verify Error Recovery Page
> 0x08    Caching Page
> 0x0a    Control Mode Page
> 0x0c    Notch and Partition Page
> 0x19
> 0x1c
> 0x21
> 0x00    Vendor-Specific
> 0x34
> 
> # for i in {0..6}
> do
> echo -n "da$i: " && ( camcontrol modepage da$i -m 0x08   | grep WCE )
> done
> da0: WCE:  0
> da1: WCE:  0
> da2: WCE:  0
> da3: WCE:  0
> da4: WCE:  0
> da5: WCE:  0
> da6: WCE:  0

That looks correct.  You might try setting "camcontrol tags" down to 64
for each drive, since that is what it seems to be falling back to.  I
haven't used the IBM disks, only Seagate, and the one's that I've used
seem to only support 64.