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Hewlett-Packard disk arrays: HASS (top) and NIKE (OEM'd Data General SCSI Clariion)
Hewlett-Packard disk arrays: HASS (top) and NIKE (OEM'd Data General SCSI Clariion)
EMC CLARiiON CX500 (Cover removed on one Shelf)
EMC CLARiiON CX500 (Cover removed on one Shelf)
EMC Symmetrix DMX1000
EMC Symmetrix DMX1000

A disk array is a disk storage system which contains multiple disk drives. EMC Corporation ( is a US Fortune 500 and S&P 500 Provider of information infrastructure systems software and services CLARiiON is a SAN Disk array manufactured and sold by EMC Corporation. EMC Corporation ( is a US Fortune 500 and S&P 500 Provider of information infrastructure systems software and services The Symmetrix is EMC's flagship Enterprise storage array. There have been seven generations of Symmetrix hardware with the first appearing in 1994 and Disk storage is a general category of a Computer storage mechanisms in which data is recorded on planar round and rotating surfaces ( disks, discs, or Disk storage is a general category of a Computer storage mechanisms in which data is recorded on planar round and rotating surfaces ( disks, discs, or It is differentiated from a disk enclosure, in that an array has cache memory and advanced functionality, like RAID and virtualization. A disk enclosure is essentially a specialized Chassis designed to hold and power Disk drives while providing a mechanism to allow them to communicate to one or more In Computer science, a cache (kæʃ like "cash") is a collection of data duplicating original RAID — which stands for Redundant Array of Inexpensive Disks,or alternatively Redundant Array of Independent Disks (a less specific name and thus now the

Components of a typical disk array include:

Typically a disk array provides increased availability, resiliency and maintainability by using additional, redundant components (controllers, power supplies, fans, etc. A disk array controller is a device which manages the physical Disk drives and presents them to the computer as logical units. In Computer science, a cache (kæʃ like "cash") is a collection of data duplicating original A disk enclosure is essentially a specialized Chassis designed to hold and power Disk drives while providing a mechanism to allow them to communicate to one or more Power supply is a reference to a source of Electrical power. A device or system that supplies Electrical or other types of Energy to an output load ), often up to the point when all single points of failure (SPOFs) are eliminated from the design. Reliability engineering is an Engineering field that deals with the study of Reliability: the ability of a System or component to perform its required Additionally those components are often hot-swappable.

Typically, disk arrays are divided into five categories: NAS, Modular SAN arrays, Monolithic SAN arrays, Storage Virtualization and Utility SAN Arrays.

Contents

Network attached storage (NAS) arrays

Network attached storage is a hard disk storage system on a network with its own LAN IP address. Network-attached storage ( NAS) is file-level Computer data storage connected to a Computer network providing data access to heterogeneous network clients NAS arrays provide file-level access to storage through such protocols as CIFS and NFS. In Computer networking, Server Message Block ( SMB) operates as an application-level network protocol mainly used to provide Shared access Examples:

Modular storage area network (SAN) arrays

A SAN is a dedicated network, separate from LANs and WANs, that is generally used to connect numerous storage resources to one or many servers. 3PAR Inc ( is an American Manufacturer of systems and software for data storage and information management EMC Corporation ( is a US Fortune 500 and S&P 500 Provider of information infrastructure systems software and services Celerra is the name for EMC 's Network Attached Storage ( NAS) family of products also referred to as Unified Storage platforms NetApp Inc ( formerly Network Appliance Inc, is a proprietary Computer storage and Data management company headquartered in Sunnyvale California In Information technology, a storage area network ( SAN) is an architecture to attach remote computer storage devices (such as Disk arrays tape libraries SAN arrays provide block-level access to storage through SCSI-based protocols such as Fibre Channel and iSCSI. Fibre Channel, or FC, is a Gigabit -speed network technology primarily used for Storage networking. In computing the iSCSI (for " Internet SCSI " protocol allows clients (called initiators) to send SCSI commands ( ''CDBs'' Modular storage system typcally consist of separate modules, which afford some level of scalability, and can be mounted in a standard rack cabinet. Modular storage systems are also sometimes referred as departmental. Examples:

Monolithic (enterprise) arrays

Although this is not a strict definition, the array is considered monolithic when even basic configuration is physically too large to fit into a standard rack cabinet. 3PAR Inc ( is an American Manufacturer of systems and software for data storage and information management EMC Corporation ( is a US Fortune 500 and S&P 500 Provider of information infrastructure systems software and services CLARiiON is a SAN Disk array manufactured and sold by EMC Corporation. is a Japanese company specializing in Semiconductors Computers ( Supercomputers Personal computers, servers, Telecommunications HP StorageWorks is an HP Portfolio of storage products including online storage nearline storage storage networking, archiving and storage software Hitachi Data Systems is a wholly owned subsidiary of Hitachi Ltd IBM System Storage (formerly IBM TotalStorage) is the brand name for IBM 's Computer storage products covering both Disk and Tape products IBM System Storage (formerly IBM TotalStorage) is the brand name for IBM 's Computer storage products covering both Disk and Tape products Infortrend Technology (普安科技 is a Taiwanese technology company specializing in RAID -related products NetApp Inc ( formerly Network Appliance Inc, is a proprietary Computer storage and Data management company headquartered in Sunnyvale California In Computing, an enterprise storage is the Computer storage designed for large-scale high-technology environments of the modern enterprises. These arrays are suited for large-scale environments. Often Enterprise storage systems provide ESCON and FICON protocols for mainframes in addition to Fibre Channel and iSCSI for open systems SANs. ESCON (Enterprise Systems Connection is a data connection created by IBM, and is commonly used to connect their Mainframe computers to peripheral devices such as FICON ( Fiber Connectivity) is the IBM proprietary name for the ANSI FC-SB-3 Single-Byte Command Code Sets-3 Mapping Protocol for Fibre Mainframes (often colloquially referred to as Big Iron) are Computers used mainly by large organizations for critical applications typically bulk data Fibre Channel, or FC, is a Gigabit -speed network technology primarily used for Storage networking. In computing the iSCSI (for " Internet SCSI " protocol allows clients (called initiators) to send SCSI commands ( ''CDBs'' Examples:

Storage virtualization

Intelligent SAN or Storage Servers (Software that adds disk controller functionality to standard server hardware platforms). EMC Corporation ( is a US Fortune 500 and S&P 500 Provider of information infrastructure systems software and services The Symmetrix is EMC's flagship Enterprise storage array. There have been seven generations of Symmetrix hardware with the first appearing in 1994 and is a Japanese company specializing in Semiconductors Computers ( Supercomputers Personal computers, servers, Telecommunications Hitachi Data Systems is a wholly owned subsidiary of Hitachi Ltd The HP Storageworks XP is an Enterprise storage Disk array sold by Hewlett-Packard. The IBM Enterprise Storage Server (ESS or the Shark is an Enterprise storage array from IBM Infortrend Technology (普安科技 is a Taiwanese technology company specializing in RAID -related products Sun Microsystems Inc ( is a multinational vendor of Computers computer components Computer software, and Information technology services Storage virtualization refers to the process of abstracting logical storage from physical storage. Hardware independent software that typically runs as a control program on top of a standard OS platform (Windows, Linux, etc. ):

Utility Storage arrays:

In Computer data storage, the IBM SAN Volume Controller ( SVC) is a block Storage virtualization appliance NetApp Inc ( formerly Network Appliance Inc, is a proprietary Computer storage and Data management company headquartered in Sunnyvale California 3PAR Inc ( is an American Manufacturer of systems and software for data storage and information management NetApp Inc ( formerly Network Appliance Inc, is a proprietary Computer storage and Data management company headquartered in Sunnyvale California Pillar Data Systems is a storage company headquartered in San Jose California. In traditional Logic, an axiom or postulate is a proposition that is not proved or demonstrated but considered to be either self-evident, or subject
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