Detected by an 'Unused variable' warning.
---
 lib/cmdlib.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/cmdlib.py b/lib/cmdlib.py
index 48b5b38..74318c8 100644
--- a/lib/cmdlib.py
+++ b/lib/cmdlib.py
@@ -4794,7 +4794,7 @@ class LUMoveInstance(LogicalUnit):
     for idx, dsk in enumerate(instance.disks):
       if dsk.dev_type not in (constants.LD_LV, constants.LD_FILE):
         raise errors.OpPrereqError("Instance disk %d has a complex layout,"
-                                   " cannot copy", errors.ECODE_STATE)
+                                   " cannot copy" % idx, errors.ECODE_STATE)
 
     _CheckNodeOnline(self, target_node)
     _CheckNodeNotDrained(self, target_node)
-- 
1.6.5.7

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