[Bug 229745] ahcich: CAM status: Command timeout

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229745

--- Comment #56 from Wayne Willcox <wwillcox7 at gmail.com> ---
Ok so it looks like I solved this for my system. I did it by reducing the
command tags.

The default was 255 and I started by just cutting that in half. I kept dividing
by 2 until I got to 25.  At 50 I only had the time outs every few days.  At 25
I have not had an error in over a week.  I could possibly increase from 25 but
I won't bother.  Performance seems to be fine and the errors are stopped.

You can do this with the camcontrol tags command
        camcontrol tags       [dev_id][generic args] [-N tags] [-q] [-v]

Here are the steps.
 camcontrol devlist
<IBM-XIV ST2000NM0001  A2 BC42>    at scbus0 target 8 lun 0 (pass0,da0)
<IBM-XIV ST2000NM0001  A2 BC42>    at scbus0 target 9 lun 0 (pass1,da1)
<IBM-XIV ST2000NM0001  A2 BC42>    at scbus0 target 10 lun 0 (pass2,da2)
<IBM-XIV ST2000NM0001  A2 BC42>    at scbus0 target 11 lun 0 (pass3,da3)
<IBM-XIV ST2000NM0001  A2 BC42>    at scbus0 target 12 lun 0 (pass4,da4)
<IBM-XIV ST2000NM0001  A2 BC42>    at scbus0 target 13 lun 0 (pass5,da5)

 camcontrol tags da5   
(pass5:mps0:0:13:0): device openings: 25

Originally mine was at 255.  This can be done on a live system and doesn't
require closing the disk and reopening it to take effect.  I just changed all
15 hdisks.

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