SAN (storage area network) Definitions

  • A

    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

    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

    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.

  • digital film

    Digital film is any storage medium (such as a memory card, diskette, or recordable CD) used in a digital camera to capture and store images.

  • direct access

    In computer storage, direct access is the ability to obtain data from a storage device by going directly to where it is physically located on the device rather than by having to sequentially look for the data at one physical location after another.

  • disk cache

    A disk cache is a mechanism for improving the time it takes to read from or write to a hard disk.

  • disk duplexing

    Disk duplexing is a variation of disk mirroring in which each of multiple storage disks has its own SCSI controller.

  • disk striping

    Disk striping divides data into blocks and spreads the blocks across hard disks or solid-state drives to accelerate read and write access.

  • disk-to-disk-to-tape (D2D2T)

    Disk-to-disk-to-tape (D2D2T) is an approach to computer storage backup and archiving in which data is initially copied to backup storage on a disk and then later on copied again to tape.

  • diskette (floppy disk)

    A diskette is a random access, removable data storage medium that can be used with personal computers.

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