[Bug 211381] L2ARC degraded, repeatedly, on Samsung SSD 950 Pro nvme

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211381

--- Comment #12 from braddeicide at hotmail.com ---
Been running r300039 in previously problematic mismatched sector size
configuration for a week, looks good.

# geli is 4k, underlying device is 512
diskinfo -v /dev/nvd0p3.eli | grep sectorsize
        4096            # sectorsize
diskinfo -v /dev/nvd0p3 | grep sectorsize
        512             # sectorsize

# zfs-stats
L2 ARC Summary: (HEALTHY)

# Cache is growing
pool           alloc   free   read  write   read  write
-------------  -----  -----  -----  -----  -----  -----
cache              -      -      -      -      -      -
  nvd0p3.eli    139G   311G      3      3  40.0K   427K

# guess compress_failures weren't a valid indicator
kstat.zfs.misc.arcstats.l2_compress_failures: 11644501
kstat.zfs.misc.arcstats.l2_writes_error: 0

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