https://docs.redhat.com/en/documentation/red_hat_streams_for_apache_kafka/2.9/html/deploying_and_managing_streams_for_apache_kafka_on_openshift/overview-str#considerations-for-data-storage-str

Currently this one:

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Efficient data storage is essential for Streams for Apache Kafka to operate effectively, and block storage is strongly recommended. Streams for Apache Kafka has been tested only with block storage, and file storage solutions like NFS are not guaranteed to work.
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Not `strongly recommended` but `mandatory`. Not `not guaranteed to work` but `does not work`.

Moreover, highlight that only POSIX compliance storage is supported.