From owner-freebsd-scsi@FreeBSD.ORG  Tue Mar  1 18:07:15 2011
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From: Erich Weiler <weiler@soe.ucsc.edu>
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Date: Tue, 1 Mar 2011 09:48:07 -0800
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Subject: MFI driver issues
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Greetings all,

I was recently having trouble with a Dell R610 server with a Perc H800 SAS c=
ontroller, which had 2 12 disk MD1200's SAS chained together (so 24 disks to=
tal).  However, I get these hangs every once in a while to the tune of:

mfi0: COMMAND xxxxx Timeout After 60 seconds

And that repeats every 30 seconds.  I can 'fix' it by doing a:

mfiutil show volumes

Oddly enough.  It then 'unfreezes'.

BTW, I'm on 8.2-PRERELEASE, with the latest snapshot from March 1st, 2011.

Now, I was following this thread:

http://old.nabble.com/mps%284%29-driver-%28LSI-6Gb-SAS%29-commited-to-stable=
-8-td30960262.html

And it looks like I may be able to use the MPT driver instead of MFI to reso=
lve my problem?  And it looks like it maybe was recently committed to 8-STAB=
LE?  But I don't see MPT in this snapshot I'm on, so maybe I'm mistaken.  An=
yone have any ideas? =20

BTW, I have the latest firmware on the controller and have even tried anothe=
r controller (same exact model) and the same lockup happens under heavy writ=
es.

Thanks for any hints!!

-erich