Trasforming the disk of an instance from DRBD to plain did not properly
update the iv_name of disks, leaving it to None.

This commit modifies _ConvertDrbdToPlain to properly set the iv_name
variables.

An analogous fix is not required in the opposite function,
_ConvertPlainToDrbd, because it uses _GenerateDiskTemplate, that already
takes care of doing that.

Fixes Issue 403.

Signed-off-by: Michele Tartara <[email protected]>
---
 lib/cmdlib.py |    1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/cmdlib.py b/lib/cmdlib.py
index 023084f..5ad1338 100644
--- a/lib/cmdlib.py
+++ b/lib/cmdlib.py
@@ -14043,6 +14043,7 @@ class LUInstanceSetParams(LogicalUnit):
     # update instance structure
     instance.disks = new_disks
     instance.disk_template = constants.DT_PLAIN
+    _UpdateIvNames(0, instance.disks)
     self.cfg.Update(instance, feedback_fn)
 
     # Release locks in case removing disks takes a while
-- 
1.7.10.4

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