If we didn't mention any storage class, will cass-operator allows to take deafult storage class. When I tried it , I was getting error like as below:
{"level":"error","ts":1605543665.3131726,"logger":"controller-runtime.controller","msg":"Reconciler error","controller":"cassandradatacenter-controller", "request":"cassandra-str/dc1","error":"storageConfig.cassandraDataVolumeClaimSpec.storageClassName is required","stacktrace":"github.com/go-logr/zapr.