Storage — page 9 of 9

Storage terms

801. video on demand (VOD) A previously recorded media stream that users can request at a time most convenient to them. Users can rewind and fast-forward on-demand media streams.
802. VIF A single virtual interface that is created from multiple physical interfaces by using the EtherChannel technology.
803. Vinegar syndrome Characteristic of the decomposition of acetate based magnetic tape where acetic acid is a substantial by-product that gives the tape a vinegar-like odor.
804. virtual channel identifier (VCI) A unique numerical tag defined by a 16-bit field in the ATM cell header that identifies a virtual channel over which the cell is to travel.
805. virtual interface (VI) An architecture designed to allow bulk data transfer directly to or from application buffers.
806. virtual local area network (VLAN) A LAN created via software rather than dedicated hardware.
807. virtual path identifier (VPI) A field in the ATM cell header that indicates the virtual path over which the cell should be routed.
808. Virtualization A feature that allows standard users to run applications that normally write to per-computer files and registry keys.
809. VLAN Virtual local area network. A LAN created via software rather than dedicated hardware.
810. VMA (Volume Mount Analyzer) an IBM utility that helps analyze the current tape environment.
811. VOD Video On Demand. A previously recorded media stream that users can request at a time most convenient to them.
812. Volume Volume is the number of shares traded in a company's stock or in an entire market over a specified period, typically a day.
813. volume copy A way of copying both data in the active file system and data in snapshots from one volume to another. Implemented using the volcopy command.
814. volume group In LVM, a set of physical volumes such that logical volumes can be defined within the volume group for user access.
815. VPI Virtual path identifier. A field in the ATM cell header that indicates the virtual path over which the cell should be routed.
816. VRS (Vital Record Specifications) are RMM retention and movement policies for data sets and volumes. See RMM.
817. VSM (Virtual Storage Manager) controls StorageTek's virtual tape system. It consists of software and disk cache.
818. Vsnap Virtual snapshot: space-efficient snapshot available on Enterprise Virtual Array family products
819. VSS (Volume Shadow Copy Service) The Volume Shadow Copy Service provides the backup infrastructure for the Microsoft Windows XP and Microsoft Windows Server 2003 operating systems, as…
820. VTCS (Virtual Tape Control System) the name of the host software component in StorageTek's Virtual Storage Manager (VSM).
821. VTD (Virtual Tape Drive) an emulation of a physical transport in the virtual tape storage subsystem (VTSS) that looks like a physical tape transport to the host.
822. VTOC (Volume Table Of Contents) the data set on a DASD volume that specifies the location of all non-SMS data sets on that volume. See VVDS.
823. VTS (Virtual Tape Servers or Systems) comprise: a robotic library to perform automated tape mounts for backend requirements; real tape transports that read and write virtual volumes from…
824. VTSS (Virtual Tape Storage Subsystem) a DASD buffer containing virtual tape volumes (VTV) and virtual tape drives (VTD). The VTSS is a StorageTek RAID 6 hardware device. See VTD and VTV.
825. VTV (Virtual Tape Volume) a DASD buffer that appears to the operating system as a real tape volume. Data can be written to and read from the VTV, and the VTV can be migrated to and…
826. VVDS (VSAM Volume Data Set) the part of the ICF catalog that resides on each DASD volume and contains information on the SMS-managed data sets on that volume. See VTOC.
827. WAFL Write Anywhere File Layout. A patented file system designed exclusively for NetApp appliances to optimize write performance.
828. WAFL check Data ONTAP utility to repair filer volumes.
829. WAFL credential cache (WCC) A temporary in-memory database that keeps mappings from UNIX UIDs to CIFS credentials.
830. WAN data replication solutions Data replication that functions over leased or switched lines. See also continental cluster.
831. WCC (1) See Wing Control Center. (2) Weapons Control Computer.
832. WCCP An open protocol that when installed on Cisco Routers enables them to transparently redirect client browser Web requests from their target Web servers to…
833. Web acceleration A specific deployment of a proxy server as a front-end accelerator between the origin servers and the incoming user connections.
834. Web accelerator A NetCache appliance configured as an intermediary server that caches content from one or more servers and provides that content to clients that request…
835. Web cache A NetCache appliance configured as an intermediary server that accepts requests from clients and forwards them to a Web server or, if appropriate…
836. Web Cache Communication Protocol (WCCP) An open protocol that when installed on Cisco Routers enables them to transparently redirect client browser Web requests from their target Web servers to…
837. Wide SCSI A SCSI protocol that allows 16- and 32-bit data transfers.
838. widelink A parameter that controls whether or not links in the UNIX file system may be followed by the server.
839. Windows Internet Naming Service (WINS) Microsoft name service.
840. WINS (Windows Internet Naming Service) Microsoft name service.
841. WMT (Windows Media Technologies) A collective term for Microsoft's streaming audio and video technologies.
842. Workgroup A group of computer users connected to share individual talents and resources as well as computer hardware and software often to accomplish a team goal.
843. WORM (Write Once Read Many) Data storage devices (e.g. CD-ROMs) where the space on the discs can only be written once. The data is permanently stored.
844. Write Anywhere File Layout (WAFL) A patented file system designed exclusively for NetApp appliances to optimize write performance. Developed by Network Appliance.
845. Yottabyte 1024 (or 1000) zettabytes.
846. zero Verb. To replace all blocks on a disk with zeros.
847. Zero-Channel RAID A technology that uses the SCSI controller on the motherboard (instead of a SCSI controller on the RAID card) to enable hardware RAID on a motherboard.
848. Zettabyte 1024 (or 1000) exabytes.
849. Zoning The ability of local governments to specify the use of private property in order to control development within designated areas of land.