This parameter is not available on recent Red Hat kernels or on
non-Red Hat kernels (it was removed on 3.10.0-772.el7,
RHBZ 1455932). The presence of the parameter on kernels that don't
support it cause the module load to fail, with the result that the
storage is not available.
Fix by removing the parameter. For someone running an older Red Hat
kernel the effect will be that discard is disabled, but they can fix
that by updating the kernel. For someone running a newer kernel, the
effect will be that they can access their data.
Fixes#3437.
Message-Id: <20180516134913.6540-1-avi@scylladb.com>
(cherry picked from commit 3b8118d4e5)
4063e92f57