SAN technology and arrays Definitions

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  • S

    SCSI (Small Computer System Interface)

    Definition: The Small Computer System Interface (SCSI) is a set of parallel interface standards used to attach disk drives and other peripherals to a computer.

  • SCSI controller (Small Computer System Interface controller)

    A SCSI controller, also called a host bus adapter (HBA), is a card or chip that allows a SCSI storage device to communicate with the operating system across a SCSI bus.

  • secondary storage

    Secondary storage is storage for noncritical data that will not be frequently accessed.

  • sector

    On a computer diskette or hard disk, a sector is one of the "pie slices" the diskette or disk is divided into.

  • Secure Digital card (SD card)

    SD cards use flash memory to provide nonvolatile storage. They are more rugged than traditional storage media and are used in more portable storage media.

  • SerDes (serializer/deserializer)

    A SerDes or serializer/deserializer is an integrated circuit (IC or chip) transceiver that converts parallel data to serial data and vice-versa.

  • Serial ATA (Serial Advanced Technology Attachment or SATA)

    The SATA storage protocol transmits data in serial fashion between hard drives and computer systems. The nonprofit SATA-IO industry consortium authors the design specification.

  • Serial Storage Architecture (SSA)

    Serial Storage Architecture (SSA) is an open standard for high-speed access to high-capacity disk storage.

  • serial-attached SCSI (SAS)

    Serial-attached SCSI (SAS) is a point-to-point protocol used to transfer digital data between servers and SAS storage devices.

  • shingled magnetic recording (SMR)

    Shingled magnetic recording (SMR) is a technique for writing data to disk drives in partially overlapping tracks to boost areal density and overall capacity.

  • SMI-S (Storage Management Initiative Specification)

    SMI-S (Storage Management Initiative Specification) is a standard developed by the Storage Network Industry Association (SNIA) that is intended to facilitate the management of storage devices from multiple vendors in storage area networks (SANs).

  • soft zoning

    Soft zoning is used to allocate resources and control access in a storage-area network (SAN).

  • software RAID (software redundant array of independent disk)

    Software RAID is a form of RAID (redundant array of independent disks) performed on the internal server.

  • spindle

    A spindle is a shaft that holds rotating hard disk drive (HDD) platters in place. The term is also often used to refer to a single HDD.

  • SSD (solid-state drive)

    An SSD (solid-state drive) is a type of nonvolatile storage media that stores persistent data on solid-state flash memory.

  • storage area management (SAM)

    Storage area management (SAM) is a still-evolving set of procedures, services, and standards for comprehensively managing the infrastructure of a storage area network (SAN), including all components within all servers, the disk arrays, the tape libraries, the switches, the routers, and the programs.

  • storage area network (SAN)

    A storage area network (SAN) is a dedicated high-speed network or subnetwork that interconnects and presents shared pools of storage devices to multiple servers.

  • storage capacity planning

    The goal of storage capacity planning is to predict how much storage an organization will require so that just enough disk space can be purchased to meet the needs of users and applications.

  • storage consolidation

    Storage consolidation, also called storage convergence is a method of centralizing data storage among multiple servers.

  • storage distance extension

    Storage distance extension refers to any of several different technologies that allow data communication in Fibre Channel storage area networks (SANs) over long spans of fiber optic cable.

  • storage medium (storage media)

    In computers, a storage medium is any technology -- including devices and materials -- used to place, keep and retrieve electronic data.

  • storage virtualization

    Storage virtualization is the pooling of physical storage from multiple storage devices into what appears to be a single storage device -- or pool of available storage capacity -- that is managed from a central console.

  • storage volume

    A definition of volume must include a comparison of the unit of data storage to a partition, as well as insight into logical volume management, a form of storage virtualization.

  • switching fabric

    Switching fabric is the combination of hardware and software that moves data coming in to a network node out by the correct port (door) to the next node in the network.

  • V

    virtual LUN or thin LUN

    A virtual LUN (virtual logical unit number) is a representation of a storage area that is not tied to any physical storage allocation. Virtual LUNs are used in thin provisioning (also known as virtual provisioning) for storage area network (SAN) management. A virtual LUN is also sometimes called a thin LUN.

  • virtual SAN appliance (VSA)

    A virtual SAN appliance (VSA) is a software bundle that allows a storage manager to turn the unused storage capacity in his network's virtual servers into a storage area network (SAN).

  • virtual storage area network (VSAN)

    A virtual storage area network (VSAN) is a logical partition in a storage area network (SAN). VSANs allow traffic to be isolated within specific portions of a storage area network.

  • W

    World Wide Name (WWN)

    A World Wide Name (WWN) is a unique identifier that is assigned to a manufacturer by the Institute of Electrical and Electronic Engineers (IEEE) and hard-coded into a Fibre Channel (FC) device.

  • Z

    zoning

    In a storage area network (SAN), zoning is the allocation of resources for device load balancing and for selectively allowing access to data only to certain users.

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