Re: 'Device not ready' issue on mpt2sas since 3.1.10

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On 07/09/2012 09:51 PM, Robert Trace wrote:
> 
> Huh..  I just retested this and I'm seeing really random behavior.

Ok, with a refined test I've been able to reliably reproduce this and I
bisected it back to commit 85ef06d1d252f6a2e73b678591ab71caad4667bb in
Linus' tree (introduced between 3.0 and 3.1):

commit 85ef06d1d252f6a2e73b678591ab71caad4667bb
Author: Tejun Heo <tj@xxxxxxxxxx>
Date:   Fri Jul 1 16:17:47 2011 +0200

    block: flush MEDIA_CHANGE from drivers on close(2)

Prior to the above commit, sleeping disks will spin up as a result of
I/O sent to them.  With the above commit, they don't spin up and
immediately return an I/O failure.

That's all the further I've gotten so far.  I'll be happy to test any
patches or suggestions.

-- Rob
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