[Bug 224496] mpr and mps drivers seems to have issues with large seagate drives

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224496

--- Comment #44 from Sharad Ahlawat <freebsd at diyit.org> ---
(In reply to Matthias Pfaller from comment #43)

logs shows the read events are still timing out, even with 90

also there are no retry messages, is "sysctl kern.cam.da.retry_count" set to 0
?

you could try a few things to get to the root cause:

a: also disable ZFS cache flush
sysctl vfs.zfs.cache_flush_disable=1
even though your drives are not SMRs

b: experiment with larger timeout values
also observe "gstat" output and ensure the first column L(q) is continually
returning to zero and not getting stuck for any of the drives

c: try setting reducing the SCIC speed to 3.0 in the controller settings; just
to eliminate some disk firmware speed compatibility issue.

Side note, not sure if this applies to your drives but a few of mine don't
support NCQ TRIM and are not properly driver blacklisted, so I had to set
vfs.unmapped_buf_allowed=0 in loader.conf

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