SAN technology and arrays Definitions

  • A

    AHCI (Advanced Host Controller Interface)

    An AHCI (Advanced Host Controller Interface) is a hardware mechanism that allows software to communicate with Serial ATA (SATA) devices.

  • areal density

    Areal density measures the amount of data that can be stored on a given amount of physical space on a disk drive.

  • ASPI (Advanced SCSI Programming Interface)

    ASPI (Advanced SCSI Programming Interface) specifies how an application program can communicate with a SCSI (Small Computer System Interface) device through a common SCSI device driver.

  • ATA over Ethernet (AoE)

    ATA over Ethernet (AoE) is an open source network protocol designed to connect storage devices and servers in a storage area network (SAN). ATA (Advanced Technology Attachment) is a standard interface for communication between storage devices; it is known in the computer industry as Integrated Drive Electronics, or IDE. In AoE, the ATA commands are transported directly via Ethernet. That makes AoE an inexpensive alternative to Fibre Channel SANs, which require costly dedicated networks.

  • B

    bad block

    A bad block is a damaged area of magnetic storage media (i.e., hard disk) that cannot reliably be used to store and retrieve data.

  • BEDO DRAM (Burst Extended Data Output DRAM)

    BEDO DRAM (Burst Extended Data Output DRAM) is a type of dynamic random access memory (DRAM) that can send data back to the computer from one read operation at the same time it is reading in the address of the next data to be sent.

  • bit rot

    Bit rot is the slow deterioration in the performance and integrity of data stored on storage media. It is also known by the names bit decay, data rot, data decay and silent corruption.

  • block storage

    Block storage is a type of data storage typically used in storage-area network (SAN) environments where data is stored in volumes, also referred to as blocks.

  • Blue Book

    The Blue Book is the informal name for the standard specification document for stamped multisession (also known as the enhanced CD or E-CD) disk format, developed in 1995 from a supplement to Philips and Sony's 1988 Orange Book.

  • buffer credits or buffer-to-buffer credits (BBCs)

    Buffer credits, also called buffer-to-buffer credits (BBCs), allow data communication in a Fibre Channelstorage area network (SAN) where there are long spans of fiber opticcable.

  • C

    converged network adapter (CNA)

    A converged network adapter (CNA) is a single network interface card (NIC) that contains both a Fibre Channel (FC) host bus adapter (HBA) and a TCP/IP Ethernet NIC.

  • D

    DASD (direct access storage device)

    Direct access storage device (DASD, pronounced DAZ-dee), is a general term for magnetic disk storage devices. The term has historically been used in the mainframe and minicomputer (mid-range computer) environments.

  • data retention

    Data retention, also called records retention, is the continued storage of an organization's data for compliance or business reasons. 

  • defragmenter

    A defragmenter is a software utility that rearranges the fragments or discontiguous parts of each file stored on a computer hard disk so that the small, empty storage spaces adjacent to fragments can be used, effectively creating new storage space and possibly making file access faster.

  • Dell EqualLogic

    Dell EqualLogic storage-area network arrays provide varying capacities of hard disk drives and solid-state drives using iSCSI and SATA controllers.

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