diff --git a/drivers/BaseISCSI.py b/drivers/BaseISCSI.py
index 67388dc1..71e43ddc 100755
--- a/drivers/BaseISCSI.py
+++ b/drivers/BaseISCSI.py
@@ -421,6 +421,10 @@ def attach(self, sr_uuid):
             if self.mpath == 'true':
                 self.mpathmodule.refresh(self.dconf['SCSIid'], 0)
             dev_path = os.path.join("/dev/disk/by-scsid", self.dconf['SCSIid'])
+            if not os.path.exists(dev_path):
+                # LUN may have been added to the SAN since the session was created
+                iscsilib.refresh_luns(self.targetIQN, self.target)
+
             if not os.path.exists(dev_path):
                 raise xs_errors.XenError('ConfigSCSIid')