[sheepdog] [PATCH 8/11] Doc. "Sheepdog Basic" add chapter "fail over"

[Valerio Pachera]

Signed-off-by: Valerio Pachera <sirio81 at gmail.com>
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 doc/fail_over.rst |   36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 doc/fail_over.rst

diff --git a/doc/fail_over.rst b/doc/fail_over.rst
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+Fail Over
+=========
+
+Now we are able to manage guests on our cluster and we want to check if it's
+really able to survive a node loss.
+Start a guest on any of the node.
+Find the node ID you wish to fail by *'vdi list'*
+(not the node where the guest is running, of course).
+Then kill the node:
+
+::
+
+    # dog node kill 3
+
+Guest is still running without any problem and by 'dog node list' you'll see
+that one node is missing.
+
+But how do we know if sheepdog is recovering the "lost" data?
+
+*(At this very moment, some objects have only 1 copy instead of 2.
+The second copy has to be rebuild on the active nodes)*.
+
+::
+
+    # dog node recovery
+    Nodes In Recovery:
+    Id   Host:Port         V-Nodes       Zone
+    0   192.168.2.41:7000      50  688040128
+    1   192.168.2.42:7000      50  704817344
+    2   192.168.2.43:7000      92  721594560
+
+Here you can see which nodes are receiving data.
+Once done, the list will be empty.
+
+**IMPORTANT:**
+do not remove other nodes from the cluster during recovery!
-- 
1.7.10.4