Improve error message for replace-disks

In some conditions, replace-disks will fail if the disks are not properly
activated. Improve the error message suggesting to run activate-disks before
executing replace-disks.

Fixes Issue 606.

Signed-off-by: Michele Tartara <mtartara@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>

diff --git a/lib/cmdlib/instance_storage.py b/lib/cmdlib/instance_storage.py
index 6478e51..b1fea8b 100644 (file)
--- a/lib/cmdlib/instance_storage.py
+++ b/lib/cmdlib/instance_storage.py
@@ -2111,8 +2111,14 @@ class TLReplaceDisks(Tasklet):
         if msg or not result.payload:
           if not msg:
             msg = "disk not found"
-          raise errors.OpExecError("Can't find disk/%d on node %s: %s" %
-                                   (idx, node, msg))
+          if not self._CheckDisksActivated(self.instance):
+            extra_hint = ("\nDisks seem to be not properly activated. Try"
+                          " running activate-disks on the instance before"
+                          " using replace-disks.")
+          else:
+            extra_hint = ""
+          raise errors.OpExecError("Can't find disk/%d on node %s: %s%s" %
+                                   (idx, node, msg, extra_hint))
 
   def _CheckDisksConsistency(self, node_name, on_primary, ldisk):
     for idx, dev in enumerate(self.instance.disks):