[Bug 191348] [mps] LSI2308 with WD3000FYYZ drives disappears after hotswapping

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191348

--- Comment #31 from Karli.Sjoberg at slu.se ---
(In reply to Stephen McConnell from comment #30)

OK, yeah we´re on the same page. The drive doesn´t show up but therein ends the
similarities.

OK, driver timeout is more appropriate but lies at the OS level, as opposed to
setting in HBA or HDD firmware, is what I meant.

There are no simple reproduction steps I can provide because I can´t really
make it happen at will, but it has happened quite frequently as of late. What I
can tell you are how the systems are setup.

You start with some hardware, add a HBA of either model 9200, 9201, 9211 or
AOC-USAS2-L8(i|e) flashed with IT FW, connect them through some kind of
expander and add at least 14 drives. That´s the least amount of drives where
I´ve seen this issue occur. Install latest FreeBSD release and opt for "Auto
ZFS", apply some pressure (preferably external over NFS, iSCSI, SMB or
something) for a few days and then watch the magic happen.

Lots of concurrent IO seems to trigger it more frequently.

/K

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