ACTIVE-ACTIVE SCALE-OUT FOR UNIFIED DATA PATH ARCHITECTURE

A technique for processing IO requests in a data storage system provides active-active access to pooled data objects from multiple storage processors. Data objects, which may include both block-based objects and file-based objects, are realized in the form of respective files stored in a set of clustered internal file systems of the data storage system. For providing active-active access to a data object, each of multiple storage processors operates such a clustered file system, which coordinates with a clustered file system on each of the other storage processors to present a consistent file system image having a single namespace across all such storage processors. On each storage processor, the clustered file system is built upon a clustered storage pool, which maintains consistency with each of the clustered storage pools running on each of the other storage processors, to present a consistent image of storage allocation across all storage processors.