kern/117688: [mpt] mpt disk timeout and hang

[Nathaniel W Filardo]

The following reply was made to PR kern/117688; it has been noted by GNATS.

From: Nathaniel W Filardo <nwf at cs.jhu.edu>
To: bug-followup at freebsd.org
Cc:  
Subject: Re: kern/117688: [mpt] mpt disk timeout and hang
Date: Mon, 21 Sep 2009 18:31:44 -0400

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 Acting on unrelated advice and a hunch, I have run "camcontrol tags $DISK -N
 16" on each of the disks attached to my mpt and have not yet suffered a
 recurrence.  When I had set tags to 24, the system was stable for a week or
 so but did ultimately succumb to this infinite loop of request
 cancellations.  camcontrol thinks that all the disks report that they can
 use up to 255 tags.
 
 Does that perhaps shed some light on the matter for somebody more qualified
 than yours truly?
 
 --nwf;
 
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