This has been reported by users, so we should have the extra debugging
available.

Signed-off-by: Guido Trotter <[email protected]>
---
 lib/cmdlib.py |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/cmdlib.py b/lib/cmdlib.py
index 0adf0f1..e600199 100644
--- a/lib/cmdlib.py
+++ b/lib/cmdlib.py
@@ -7056,7 +7056,8 @@ def _ExpandCheckDisks(instance, disks):
   else:
     if not set(disks).issubset(instance.disks):
       raise errors.ProgrammerError("Can only act on disks belonging to the"
-                                   " target instance")
+                                   " target instance: %r versus %r" %
+                                   (disks, instance.disks))
     return disks
 
 
-- 
1.7.10.4

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