[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 #4 from braddeicide at hotmail.com ---
Yes I was suspicious of the script when I removed and readded the device and it
worked for a while, but the script kept saying degraded.  How I can tell it's
gone wrong again however is in zpool iostat -v when all data is dropped from
the arc and capacity stays 100% free despite writes.

# dtrace -n 'sdt:::l2arc-iodone /args[0]->io_error != 0/ { printf("io_error =
%d", args[0]->io_error); }'
dtrace: description 'sdt:::l2arc-iodone ' matched 1 probe
dtrace: buffer size lowered to 512k
CPU     ID                    FUNCTION:NAME
  0  57400                none:l2arc-iodone io_error = 22
  3  57400                none:l2arc-iodone io_error = 22
  1  57400                none:l2arc-iodone io_error = 22
  1  57400                none:l2arc-iodone io_error = 22
  1  57400                none:l2arc-iodone io_error = 22
  3  57400                none:l2arc-iodone io_error = 22
  3  57400                none:l2arc-iodone io_error = 22
  3  57400                none:l2arc-iodone io_error = 22
  1  57400                none:l2arc-iodone io_error = 22
  3  57400                none:l2arc-iodone io_error = 22
  0  57400                none:l2arc-iodone io_error = 22
  1  57400                none:l2arc-iodone io_error = 22
  0  57400                none:l2arc-iodone io_error = 22
  2  57400                none:l2arc-iodone io_error = 22

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