Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 91 insertions, 0 deletions

diff --git a/doc/rbd/iscsi-initiator-linux.rst b/doc/rbd/iscsi-initiator-linux.rst
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+-------------------------
+iSCSI Initiator for Linux
+-------------------------
+
+**Prerequisite:**
+
+-  Package ``iscsi-initiator-utils``
+
+-  Package ``device-mapper-multipath``
+
+**Installing:**
+
+Install the iSCSI initiator and multipath tools:
+
+   ::
+
+       # yum install iscsi-initiator-utils
+       # yum install device-mapper-multipath
+
+**Configuring:**
+
+#. Create the default ``/etc/multipath.conf`` file and enable the
+   ``multipathd`` service:
+
+   ::
+
+       # mpathconf --enable --with_multipathd y
+
+#. Add the following to ``/etc/multipath.conf`` file:
+
+   ::
+
+       devices {
+               device {
+                       vendor                 "LIO-ORG"
+                       hardware_handler       "1 alua"
+                       path_grouping_policy   "failover"
+                       path_selector          "queue-length 0"
+                       failback               60
+                       path_checker           tur
+                       prio                   alua
+                       prio_args              exclusive_pref_bit
+                       fast_io_fail_tmo       25
+                       no_path_retry          queue
+               }
+       }
+
+#. Restart the ``multipathd`` service:
+
+   ::
+
+       # systemctl reload multipathd
+
+**iSCSI Discovery and Setup:**
+
+#. If CHAP was setup on the iSCSI gateway, provide a CHAP username and
+   password by updating the ``/etc/iscsi/iscsid.conf`` file accordingly.
+
+#. Discover the target portals:
+
+   ::
+
+       # iscsiadm -m discovery -t st -p 192.168.56.101
+       192.168.56.101:3260,1 iqn.2003-01.org.linux-iscsi.rheln1
+       192.168.56.102:3260,2 iqn.2003-01.org.linux-iscsi.rheln1
+
+#. Login to target:
+
+   ::
+
+       # iscsiadm -m node -T iqn.2003-01.org.linux-iscsi.rheln1 -l
+
+**Multipath IO Setup:**
+
+The multipath daemon (``multipathd``), will set up devices automatically
+based on the ``multipath.conf`` settings. Running the ``multipath``
+command show devices setup in a failover configuration with a priority
+group for each path.
+
+::
+
+    # multipath -ll
+    mpathbt (360014059ca317516a69465c883a29603) dm-1 LIO-ORG ,IBLOCK
+    size=1.0G features='0' hwhandler='1 alua' wp=rw
+    |-+- policy='queue-length 0' prio=50 status=active
+    | `- 28:0:0:1 sde  8:64  active ready running
+    `-+- policy='queue-length 0' prio=10 status=enabled
+      `- 29:0:0:1 sdc  8:32  active ready running
+
+You should now be able to use the RBD image like you would a normal
+multipath’d iSCSI disk.