Storage management tools Definitions

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  • A

    access method

    In computing, an access method is a program or a hardware mechanism that moves data between the computer and an outlying device such as a hard disk (or other form of storage) or a display terminal.

  • address space

    Address space is the amount of memory allocated for all possible addresses for a computational entity, such as a device, a file, a server, or a networked computer.

  • Andrew file system (AFS)

    An Andrew file system (AFS) is a location-independent file system that uses a local cache to reduce the workload and increase the performance of a distributed computing environment.

  • application-aware storage

    Application-aware storage is a storage system with built-in intelligence about relevant applications and their utilization patterns.

  • 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.

  • B

    bare metal restore

    In disaster recovery, a bare metal restore is the process of reformatting a computer from scratch after a catastrophic failure.

  • 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.

  • buffer flush

    A buffer flush is the transfer of computer data from a temporary storage area to the computer's permanent memory.

  • bus

    In a computer or on a network, a bus is a transmission path on which signals are dropped off or picked up at every device attached to the line.

  • C

    cache algorithm

    A cache algorithm is a detailed list of instructions that decides which items should be discarded in a computer's cache of information.

  • capacity optimization (CO)

    Capacity optimization (CO) is a technique for getting more data on a storage medium by analyzing the data for unique repetitive patterns that can be stored as and reassembled from shorter symbols.

  • CD burner (CD recorder)

    A CD burner is the informal name for a CD recorder, a device that can record data to a compact disc.

  • CD-Bridge Disc

    A CD-Bridge Disc (sometimes just called a bridge disc) is a compact disc (CD) format that includes extra information on a CD-ROM XA (extended architecture) track, so that the disc can be played on either a CD-i (interactive) player attached to a television, or a CD-ROM XA drive attached to a computer.

  • CD-i (Compact Disc - interactive)

    CD-i (Compact Disc - interactive) is the multimedia CD format specified in 1986 (in the Green Book).

  • CD-Magneto Optical (CD-MO)

    CD-Magneto Optical (CD-MO) is a compact disc format that uses magnetic fields for data storage.

  • CD-R (compact disc, recordable)

    CD-R (for compact disc, recordable) is a type of write once, read many (WORM) compact disc (CD) format that allows one-time recording on a disc.

  • CD-R shelf life

    CD-R shelf life refers to the length of time that a burned compact disc will remain viable once data has been burned onto it... (Continued)

  • CD-ROM XA (Compact Disc - read-only-memory, extended architecture)

    CD-ROM XA (Compact Disc - read-only-memory, extended architecture) is a modification of CD-ROM that defines two new types of sectors that enable it to read and display data, graphics, video, and audio at the same time.

  • CD-RW (compact disc, rewriteable)

    CD-RW (for compact disc, rewriteable) is a compact disc (CD) format that allows repeated recording on a disc.

  • charge-coupled device (CCD)

    A charge-coupled device (CCD) is a light-sensitive integrated circuit that stores and displays the data for an image in such a way that each pixel (picture element) in the image is converted into an electical charge the intensity of which is related to a color in the color spectrum.

  • COLD (Computer Output to Laser Disk)

    COLD (Computer Output to Laser Disk) is a system for archiving data such as business records and reports to one or more optical disks in a compressed but easily retrievable format.

  • Common Information Model (CIM)

    The Common Information Model (CIM) is a computer industry standard for defining device and application characteristics so that system administrators and management programs will be able to control devices and applications from different manufacturers or sources in the same way.

  • compact disc (CD)

    A compact disc is a portable storage medium that can be used for recording, storing and playing back audio, video and other data in digital form.

  • CompactFlash card (CF card)

    A CompactFlash card (CF card) is a memory card format developed by SanDisk in 1994 that uses flash memory technology to store data on a very small portable device.

  • compression artifact

    A compression artifact is the fuzz or distortion in a compressed image or sequence of video images.

  • content-addressed storage (CAS)

    Content-addressed storage (CAS) is a method of providing fast access to fixed content (data that is not expected to be updated) by assigning it a permanent place on disk. CAS makes data retrieval straightforward by storing it in such a way that an object cannot be duplicated or modified once it has been stored; thus, its location is unambiguous.

  • 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.

  • copy data

    Copy data is the electronic data that is created as a result of data protection functions like backups, snapshots and disaster recovery.

  • copy data management (CDM)

    Copy data management (CDM) is an approach to reducing storage consumption that involves eliminating the unnecessary duplication of production data.

  • 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 availability

    Data availability is a term used by some computer storage manufacturers and storage service providers (SSPs) to describe products and services that ensure that data continues to be available at a required level of performance in situations ranging from normal through "disastrous.

  • data compression

    Data compression is a reduction in the number of bits needed to represent data.

  • data management platform (DMP)

    A data management platform (DMP), also referred to as a unified data management platform (UDMP), is a centralized system for collecting and analyzing large sets of data originating from disparate sources.

  • data migration

    Data migration is the process of transferring data between data storage systems, data formats or computer systems.

  • 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.

  • depository

    A depository is a file or set of files in which data is stored for the purpose of safekeeping or identity authentication.

  • 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.

  • E

    enhanced CD (E-CD)

    Enhanced CD (E-CD) is a compact disc (CD) format that enables discs to be played on either a CD player or a multimedia-capable device, such as a CD-i player, or a DVD-ROM, or CD-ROM drive, where added material can be displayed.

  • enterprise storage

    Enterprise storage is a centralized repository for business information that provides common data management, protection and data sharing functions through connections to computer systems.

  • F

    Fibre Channel Arbitrated Loop (FC-AL)

    A Fibre Channel Arbitrated Loop (FC-AL) is a high-speed Fibre Channel (FC) topology that can connect up to 126 ports on one controller using a one-way loop or hub design.

  • flash memory card

    Flash storage memory cards use nonvolatile semiconductor memory to store pictures, audio and video data on portable and remote devices.

  • H

    hard zoning

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

  • HSM (Hierarchical Storage Management)

    HSM (Hierarchical Storage Management) is policy-based management of file backup and archiving in a way that uses storage devices economically and without the user needing to be aware of when files are being retrieved from backup storage media.

  • I

    IDE (Integrated Drive Electronics)

    Integrated Drive Electronics (IDE) refers to the integration of the controller and drive.

  • InfiniBand

    InfiniBand is an architecture and specification for data flow between processors and I/O devices. The technology is most often used in high-performance computing (HPC) environments... (Continued)

  • IPI (Intelligent Peripheral Interface)

    IPI (Intelligent Peripheral Interface) is a high-bandwidth interface between a computer and a hard disk or a tape device.

  • L

    Load DynamiX

    Load DynamiX is a storage performance testing appliance that can simulate production workloads and virtual desktop infrastructure workloads to determine how a system handles stress before putting that system into production. Appliances support all major storage protocols.

  • LUN management

    LUN management is the process of assigning, provisioning and overseeing logical unit numbers (LUNs) across a storage environment.

  • LUN masking

    LUN masking is a further constraint added to zoning, subdividing access to the port so that only LUNs authorized to access a specific server can access the corresponding port.

  • LUN zoning

    LUN zoning is a method of configuring SAN fabric to match logical unit numbers (LUNs) to the proper servers. As a rule, end devices such as hosts can only see and access storage within their zone. Limiting access in this way improves security and allows bandwidth allocation through assigning particular ports to a zone.

  • M

    MAID (massive array of idle disks)

    MAID (massive array of idle disks) is a storage technology in which only those disk drives in active use are spinning at any given time...

  • Memory Stick

    Developed by Sony, the Memory Stick is a digital data storage technology with up to 10 times the storage capacity of a 3.5 diskette.

  • Microsoft Volume Shadow Copy Service (Microsoft VSS)

    Microsoft VSS is a Windows Server feature used for backing up and restoring LUNs and individual files.

  • mirror site

    A mirrored site is a website or set of files on a server that has been copied to another server so that the site or files are available from more than one place.

  • MRAM (magnetoresistive random access memory)

    MRAM (magnetoresistive random access memory) is a way to store data bits using magnetic states instead of the electrical charges used by dynamic random access memory (DRAM).

  • MrSID (Multi-resolution Seamless Image Database)

    MrSID (Multi-resolution Seamless Image Database) is an image compressor, viewer, and file format for extremely large raster graphics images.

  • multisession CD

    A multisession CD is a recordable CD format (like a CD-R) that allows the recording of a compact disk to be conducted in more than one recording session.

  • O

    object storage

    Object storage, also called object-based storage, is an approach to addressing and manipulating units of storage called objects, in which files and metadata are combined.

  • optical disc

    An optical disc is an electronic data storage medium that can be written to and read from using a low-powered laser beam.

  • optical media

    Optical media - such as the compact disk (CD) - are storage media that hold content in digital form and that are written and read by a laser; these media include all the various CD and DVD variations, as well as optical jukeboxes and autochangers.

  • optical storage

    Optical storage is any storage type in which data is written and read with a laser. Typically, data is written to optical media, such as compact discs (CDs) and DVDs.

  • Orange Book

    Orange Book is the informal name for Philips and Sony's Recordable CD Standard.

  • oversubscription

    Oversubscription, in a SAN (storage area network) switching environment, is the practice of connecting multiple devices to the same switch port to optimize switch use... (Continued)

  • P

    packet writing

    Packet writing is a technology that enables the writing of data to a recordable compact disk (CD-R) incrementally, in multiple small blocks of data, rather than in a single block (as in disk-at-once recording), or in blocks defined by tracks (as in track-at-once recording), the other two common methods.

  • parallel I/O

    Parallel I/O is a way of performing multiple input/output operations concurrently, rather than serially.

  • partition

    Partitioning a hard disk drive is the first step in preparing it for data storage. A disk partition is a carved out logical space used to manage operating systems and files.

  • phase change

    Phase change is a type of compact disk (CD) recording technology that enables the disks to be written, erased, and rewritten through the use of a layer of a special material (called the phase change layer) that can be changed repeatedly from an amorphous (formless) to a crystalline state, or phase-through exposure to variably-powered laser beams.

  • pNFS (Parallel NFS)

    The Parallel Network File System (pNFS) is part of the NFS v4.1 protocol that allows compute clients to access storage devices directly and in parallel.

  • Purple Book

    The Purple Book is the informal name for Philips and Sony's specification document for the double-density compact disk (DDCD) format.

  • Q

    QNAP Systems Inc. (Quality Network Appliance Provider Systems Inc.)

    QNAP Systems Inc. is a Taiwanese-based storage vendor specializing in hardware systems for file sharing, storage management, virtualization and cloud services as well as surveillance applications for home and businesses.

  • R

    RAID (redundant array of independent disks)

    RAID (redundant array of independent disks) is a way of storing the same data in different places on multiple hard disks or solid-state drives to protect data in the case of a drive failure.

  • RAM (Random Access Memory)

    RAM (Random Access Memory) is the hardware in a computing device where the operating system (OS), application programs and data in current use are kept so they can be quickly reached by the device's processor.

  • Red Book

    The Red Book is the 1980 document that provides the specifications for the standard compact disc (CD) developed by Sony and Philips.

  • RIMM

    In a computer, a RIMM is a memory module developed by Kingston Technology Corp.

  • S

    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.

  • SmartMedia card

    A SmartMedia card (originally called a solid-state floppy disk card, or SSFDC) is a memory card developed by Toshiba that uses flash memory to store data and to make it portable among devices, such as digital cameras, personal digital assistants (PDAs), and other handheld devices.

  • soft zoning

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

  • software-defined storage (SDS)

    Software-defined storage (SDS) is a computer program that manages data storage resources and functionality and has no dependencies on the underlying physical storage hardware.

  • Sound Designer II (SD2)

    SDII (Sound Designer II, sometimes seen abbreviated as SD2) is a monophonic/stereophonic audio file format, originally developed by Digidesign for their Macintosh-based recording/editing products.

  • Standard MIDI File (SMF)

    The SMF (Standard MIDI File) was developed to allow musicians and audio file developers to transfer their sequenced MIDI data from one software application to another.

  • 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 at the edge

    Storage at the edge is the collective methods and technologies that capture and retain digital information at the periphery of the network, as close to the originating source as possible.

  • 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 medium (storage media)

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

  • storage provisioning

    Storage provisioning is the process of assigning storage, usually in the form of server disk drive space, in order to optimize the performance of a storage area network (SAN)...(Continued)

  • storage resource management (SRM)

    An important goal of storage resource management is to make it easier for storage administrators to reclaim unused storage

  • 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.

  • Super Audio CD (SACD)

    Super Audio Compact Disk (SACD) is a high-resolution audio CD format.

  • 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.

  • T

    thin provisioning (TP)

    Thin provisioning (TP) is a method of optimizing the efficiency with which the available space is utilized in storage area networks... (Continued)

  • thin server

    In the computer industry, a thin server is a PC that contains just enough hardware and software to support a particular function that users can share in a network, such as access to files on a storage device, access to CD-ROM drives, printing, or Internet access.

  • thin-film disk

    A thin-film disk is a hard disk storage medium with a very thin coating of a metallic alloy or glass instead of the usual carbon-based material found on other types of hard disks.

  • Travan

    Travan is a linear magnetic tape product developed by the 3M Company... (Continued)

  • U

    unified storage (multiprotocol storage)

    Unified storage -- sometimes called network unified storage or multiprotocol storage -- is a storage system that runs and manages files and applications from a single device.

  • USB flash drive

    A USB flash drive -- also known as a stick, thumb or pen drive -- is a plug-and-play portable storage device that uses flash memory and can attach to a keychain.

  • V

    VCD (video CD or video compact disc)

    VCD (also called video CD, video compact disc or "disc") is a compact diskformat based on CD-ROM XAthat is specifically designed to hold MPEG-1video data and to include interactive capabilities.

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