diff --git a/os_brick/exception.py b/os_brick/exception.py
index 76023fb7c..22083d438 100644
--- a/os_brick/exception.py
+++ b/os_brick/exception.py
@@ -96,25 +96,5 @@ class VolumeDeviceNotFound(BrickException):
     message = _("Volume device not found at %(device)s.")
 
 
-class VolumeGroupNotFound(BrickException):
-    message = _('Unable to find Volume Group: %(vg_name)s')
-
-
-class VolumeGroupCreationFailed(BrickException):
-    message = _('Failed to create Volume Group: %(vg_name)s')
-
-
-class ISCSITargetCreateFailed(BrickException):
-    message = _("Failed to create iscsi target for volume %(volume_id)s.")
-
-
-class ISCSITargetRemoveFailed(BrickException):
-    message = _("Failed to remove iscsi target for volume %(volume_id)s.")
-
-
-class ISCSITargetAttachFailed(BrickException):
-    message = _("Failed to attach iSCSI target for volume %(volume_id)s.")
-
-
 class ProtocolNotSupported(BrickException):
     message = _("Connect to volume via protocol %(protocol)s not supported.")