[Bug 204484] ZFS caches on 4K GELI devices accumulate inordinate write errors

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204484

            Bug ID: 204484
           Summary: ZFS caches on 4K GELI devices accumulate inordinate
                    write errors
           Product: Base System
           Version: 10.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dcamp at alumni.ufl.edu

When zpool creates a cache on a GELI device providing 4K sectors the pool
immediately reports message ZFS-8000-9P. The cache device experiences an
inordinate number of write errors -- over a million write errors a day (about
11.8 per second).

Using a GELI device with 512b sectors does not exhibit this problem but, of
course, degrades encryption performance.

This appears to be the same bug as FreeNAS Bugs #6734
(https://bugs.freenas.org/issues/6734) and #7092
(https://bugs.freenas.org/issues/7092), although I'm unclear why they consider
the former resolved.

I don't imagine it matters, but the underlying drive sector size is 512 logical
/ 512 physical.

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