[Bug 224536] FLUSHCACHE48 AHCI Timeouts on SMR Drives

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224536

            Bug ID: 224536
           Summary: FLUSHCACHE48 AHCI Timeouts on SMR Drives
           Product: Base System
           Version: 11.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ilgenox at yahoo.it

Hi!
Starting from this thread:

https://forums.freenas.org/index.php?threads/a-long-journey-to-solve-cam-status-command-timeout-issues.59549/

I had hard times troubleshooting this issue on FreeNAS with 4 x ST8000AS0002
Drives.
It seems that drives increase latency over time and exceed the AHCI
(hardcoded?) 31000 msec timeout.
It will be great if FreeBSD could support these new SMR drives without
disabling cache flushing on ZFS.

Thanks,
Fabio

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