Comment 2 for bug 1622957

I found this bug, it seems that he still has the meaning of renewal. Next to explain why:
1. Although we parse the type, but not in the cluster creation process will be passed to instance-create:
https://github.com/openstack/trove/blob/master/trove/common/strategies/cluster/experimental/galera_common/api.py#L111

2. After the above problem is solved, we need to face the problem is, create can deliver volume_type, the same, grow should also need this parameter.

I will have recently modified this question