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Date: Thu, 19 May 2011 17:20:22 -0400
From: John D <jwd@SlowBlink.Com>
To: mj@feral.com
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Cc: freebsd-geom@freebsd.org
Subject: Re: LSI 9200-8e/gmultipath/ZFS cable pull kernel crash
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----- mjacob@freebsd.org's Original Message -----
> 
> On Thu, 19 May 2011, John D wrote:
> 
> >..
> 
> Not a zfs issue I believe, so dropping them -fs the thread.
> 
> When you do the cable pull, is any I/O active?

   Yes, I have about 600MB/s running to the array:

dd if=/dev/zero bs=1m | mbuffer -m 64m -o /lsi/bigfile

with mbuffer reporting the following

in @  697 MiB/s, out @  697 MiB/s, 11.8 GiB total, buffer 100% full

when I pull the cable. Playing with it today, I'm wondering if the
1st cable actually has any active providers on it (luck of the
draw that I pulled it first), and the 2nd has all the active
providers on it.  I have not explicity tried to balance the i/o
on the two cables with gmultipath rotate.

Having a bit of trouble getting a good objdump of g_multipath.o
so I may do a new src update.

Thx