[illumos] [OpenIndiana Distribution - Bug #618] i/o hang with mega_sas driver

[illumos project]

Issue #618 has been updated by Ken Mays.

Target version deleted (oi_151_stable)
% Done changed from 100 to 0


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Bug #618: i/o hang with mega_sas driver
https://www.illumos.org/issues/618

Author: Steve Jacobson
Status: New
Priority: High
Assignee: OI illumos
Category: Drivers
Target version: 
Difficulty: Expert
Tags: megaraid


We have a system that has five (5) MegaRAID 8888ELP cards.  of the 10 channels on these cards, 9 of them are connected to 4 SATA drives each, for a total of 36 drives.   Whenever there is significant i/o, the i/o will hang on the system with the following symptoms:

* iostat -x shows that some of the drives are 100% blocked.  When this happens, the number of drives varies.  This most recent hang, there were six drives in this state.  They are always connected to a single controller, although which controller varies.
* ZFS commands all hang
* The command that was running (in this case a 'cp' commaand) also hangs.
* The box cannot be rebooted using either shutdown or reboot.  A power cycle is required
* There is nothing in /var/adm/messages related to disk i/o at the time of the hang, or since the last boot.

I'm attaching the output of "echo '::threadlist -v' | mdb -k" to this bug.  Please let me know what other information I can provide.

Thanks!

-Steve J



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