Celerra is a discontinued NAS device produced by EMC Corporation, available either 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 the CIFS, NFS, FTP, NDMP, TFTP and MPFS protocols. A Celerra Unified Storage device use Clariion storage array as its storage layer and also provides iSCSI and Fibre Channel block-level storage.
Optional features included de-duplication, replication, NDMP and storage tiering.
Celerra runs on real-time operating system called Data Access in Real Time (DART). DART is a modified DOS embedded kernel (just 32Mb) with additional functionality like Fibre Channel driver for HBA and Bonding For Ethernet 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.
Comparable to Celerra products are products from NetApp which offer similar features and protocol support, apart from the ability to use block-level Fibre Channel.