Re: [PATCH] scsi: Update Aic94xx SAS/SATA Linux open source devicedriver for new sequence firmware.

["Darrick J. Wong" <djwong@us.ibm.com>]

Wu, Gilbert wrote:
> Hi Darrick,
> 
>  We can duplicate the problem here. The aic94xx with V28 passed IO
> testing overnight if we apply IO directly to /dev/sd?.  But it fails
> very quickly when we create a partition and format it as ext3. The V17
> sequencer works fine with both cases. We are looking into it and find
> the root cause ASAP.

This may be fairly self evident by now, but it looks like the sequencer
for the link (LSEQ, I think?) is somehow locking up, which explains why
the scsi_cmnds start timing out and after that all commands (stp, phy
control, etc) time out as well.  The other drives continue operating
normally, so I don't think the central sequencer isn't borked up.

Then again, you guys at Adaptec have the sequencer source code works and
I don't, so I can't do much more than make vague guesses. Oh well :(

--D