Celerra is a discontinued NAS device produced by EMC Corporation

EMC Corporation

EMC Corporation , a Financial Times Global 500, Fortune 500 and S&P 500 company, develops, delivers and supports information infrastructure and virtual infrastructure hardware, software, and services. EMC is headquartered in Hopkinton, Massachusetts, USA.Former Intel executive Richard Egan and his...

. 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

CLARiiON

CLARiiON is a discontinued SAN disk array manufactured and sold by EMC Corporation, it occupies the entry-level and mid-range of EMC's SAN disk array products....

 or a Symmetrix

Symmetrix

The Symmetrix system is EMC Corporation's flagship enterprise storage array. The Symmetrix development has been led by Moshe Yanai, who joined EMC in 1987, until shortly before his leaving EMC in 2001. There have been many generations of Symmetrix hardware, with the first appearing in 1990 and the...

. It supports CIFS, NFS

NFS

NFS may mean:* Network File System , the Network File System protocol developed by Sun Microsystems* NFS , a former Icelandic television news service* National Financial Switch, a bank network in India...

, FTP, NDMP

NDMP

NDMP, or Network Data Management Protocol, is a protocol invented by the NetApp and Legato companies, meant to transport data between NAS devices and backup devices...

, TFTP and MPFS

Multi Path File System

In computing MPFS - Multi Protocol File System is a multi-path network filesystem technology developed by EMC. MPFS is intended to allow hundreds to thousands of client computer nodes to access shared computer data with higher performance than conventional NAS file sharing protocols such as NFS.-...

 protocols. The Unified device uses a CLARiiON as its storage layer so also provides iSCSI

ISCSI

In computing, iSCSI , is an abbreviation of Internet Small Computer System Interface, an Internet Protocol -based storage networking standard for linking data storage facilities. By carrying SCSI commands over IP networks, iSCSI is used to facilitate data transfers over intranets and to manage...

 and fibre channel block-level storage.

Celerra is promoted as a platform for virtualization

Hardware virtualization

Computer hardware virtualization is the virtualization of computers or operating systems. It hides the physical characteristics of a computing platform from users, instead showing another abstract computing platform...

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.

As of 2011 the Clariion and Celerra products have been replaced by the new VNX series of unified storage disk arrays.