Migrate ZFS-* message descriptions (#49)

Prerequisite for changing the URLs in the command outputs from
zfsonlinux.org to openzfs.github.io/openzfs-docs/

Signed-off-by: Ryan Moeller <ryan@iXsystems.com>

docs/msg/ZFS-8000-5E/index.rst

@@ -0,0 +1,88 @@
+..
+   CDDL HEADER START
+
+   The contents of this file are subject to the terms of the
+   Common Development and Distribution License (the "License").
+   You may not use this file except in compliance with the License.
+
+   You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+   or http://www.opensolaris.org/os/licensing.
+   See the License for the specific language governing permissions
+   and limitations under the License.
+
+   When distributing Covered Code, include this CDDL HEADER in each
+   file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+   If applicable, add the following below this CDDL HEADER, with the
+   fields enclosed by brackets "[]" replaced with your own identifying
+   information: Portions Copyright [yyyy] [name of copyright owner]
+
+   CDDL HEADER END
+
+   Portions Copyright 2007 Sun Microsystems, Inc.
+
+.. highlight:: none
+
+Message ID: ZFS-8000-5E
+=======================
+
+Corrupted device label in non-replicated configuration
+------------------------------------------------------
+
++-------------------------+--------------------------------------------------+
+| **Type:**               | Error                                            |
++-------------------------+--------------------------------------------------+
+| **Severity:**           | Critical                                         |
++-------------------------+--------------------------------------------------+
+| **Description:**        | A device could not be opened due to a missing or |
+|                         | invalid device label and no replicas are         |
+|                         | available.                                       |
++-------------------------+--------------------------------------------------+
+| **Automated Response:** | No automated response will be taken.             |
++-------------------------+--------------------------------------------------+
+| **Impact:**             | The pool is no longer available.                 |
++-------------------------+--------------------------------------------------+
+
+.. rubric:: Suggested Action for System Administrator
+
+.. rubric:: For an active pool:
+
+If this error was encountered while running ``zpool import``, please see the
+section below.  Otherwise, run ``zpool status -x`` to determine which pool has
+experienced a failure:
+
+::
+
+   # zpool status -x
+     pool: test
+    state: FAULTED
+   status: One or more devices could not be used because the the label is missing
+           or invalid.  There are insufficient replicas for the pool to continue
+           functioning.
+   action: Destroy and re-create the pool from a backup source.
+      see: https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-5E
+    scrub: none requested
+   config:
+
+           NAME        STATE     READ WRITE CKSUM
+           test        FAULTED      0     0     0  insufficient replicas
+             c0t0d0    FAULTED      0     0     0  corrupted data
+             c0t0d1    ONLINE       0     0     0
+
+   errors: No known data errors
+
+The device listed as FAULTED with 'corrupted data' cannot be opened due to a
+corrupt label.  ZFS will be unable to use the pool, and all data within the
+pool is irrevocably lost.  The pool must be destroyed and recreated from an
+appropriate backup source.  Using replicated configurations will prevent this
+from happening in the future.
+
+.. rubric:: For an exported pool:
+
+If this error is encountered during ``zpool import``, the action is the same.
+The pool cannot be imported - all data is lost and must be restored from an
+appropriate backup source.
+
+.. rubric:: Details
+
+The Message ID: ``ZFS-8000-5E`` indicates a device which was unable to be
+opened by the ZFS subsystem.