Celerra is a discontinuedNAS device produced by EMC Corporation. It was available as an integrated unit or as a NAS header which can be added to an independent EMC storage array such as a CLARiiON or a Symmetrix. It supports CIFS, NFS, FTP, NDMP, TFTP and MPFS protocols. The Unified device uses a CLARiiON as its storage layer so also provides iSCSI and fibre channel block-level storage.

Celerra is promoted as a platform for virtualization

Optional features include de-duplication, replication, NDMP and storage tiering.

Celerra runs on real-time operating system called as Data Access in Real Time (DART). DART OS is a modified UNIX kernel with additional functionality added to operate as a file server.

Celerra is based on the same X-blade architecture as the CLARiiON. It is available with a single data mover X-blade or with multiple data movers in an active-passive N+1 configuration.

Celerra's best-known competitor is NetApp. Both offer similar features and protocol support, apart from the ability to use block-level fibre channel.