RBD: Add comment about multiattach support
Add a comment discouraging multiattach support
being flipped on without proper investigation and
design.
@@ -473,6 +473,13 @@ class RBDDriver(driver.CloneableImageVD,
'provisioned_capacity_gb': 0,
'reserved_percentage': (
self.configuration.safe_get('reserved_percentage')),
+ # NOTE(eharney): Do not enable multiattach for this driver.
+ # For multiattach to work correctly, the exclusive-lock
+ # feature required by ceph journaling must be disabled.
+ # This has implications for replication and other Cinder
+ # operations.
+ # Multiattach support for this driver will be investigated
+ # as multi-attach support in Cinder matures.
'multiattach': False,
'thin_provisioning_support': True,
'max_over_subscription_ratio': (
