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Date:      Tue, 26 Jul 2016 21:08:36 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-bugs@FreeBSD.org
Subject:   [Bug 211381] L2ARC degraded, repeatedly, on Samsung SSD 950 Pro nvme
Message-ID:  <bug-211381-8-J71xSpwqru@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-211381-8@https.bugs.freebsd.org/bugzilla/>
References:  <bug-211381-8@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D211381

--- Comment #4 from braddeicide@hotmail.com ---
Yes I was suspicious of the script when I removed and readded the device an=
d 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 !=3D 0/ { printf("io_err=
or =3D
%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 =3D 22
  3  57400                none:l2arc-iodone io_error =3D 22
  1  57400                none:l2arc-iodone io_error =3D 22
  1  57400                none:l2arc-iodone io_error =3D 22
  1  57400                none:l2arc-iodone io_error =3D 22
  3  57400                none:l2arc-iodone io_error =3D 22
  3  57400                none:l2arc-iodone io_error =3D 22
  3  57400                none:l2arc-iodone io_error =3D 22
  1  57400                none:l2arc-iodone io_error =3D 22
  3  57400                none:l2arc-iodone io_error =3D 22
  0  57400                none:l2arc-iodone io_error =3D 22
  1  57400                none:l2arc-iodone io_error =3D 22
  0  57400                none:l2arc-iodone io_error =3D 22
  2  57400                none:l2arc-iodone io_error =3D 22

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