Storage — page 4 of 9

Storage terms

301. GbE Gigabit Ethernet. A type of high-speed network hardware. Also known as 1000base-T.
302. GBIC (Gigabit Interface Converter) An acronym for "Gigabit Interface Converter". A GBIC is astandard for transceivers commonly used with Gigabit Ethernetand Fibre Channel.
303. General Availability An FCS release that has demonstrated high availability and reliability over a sufficient number of customer sites.
304. Geo-Dispersed Cluster A geo–dispersed, or multi-site, cluster is a cluster configuration used to help ensure high system and application availability in the event of…
305. GID Group ID--in Unix, the numeric group ID that the "operating system" uses to identify you and members of your "group".
306. gigabit (Gb) One billion bits. Unit of measure for data transfer.
307. Gigabit Ethernet (GbE) A type of high-speed network hardware. Also known as 1000base-T.
308. Gigabyte A unit of information or computer storage equal to 1,024Megabytes. Abbreviated GB, not to be confused with Gb, whichis used for gigabits.
309. Gigabyte (GB) A gigabyte is a measure of computer data storage capacity and is a billion (1,000,000,000) bytes.
310. giveback The return of identity from the emulated filer to the failed filer, resulting in a return to normal operation. The reverse of takeover.
311. Global File System In some configurations, as with clusters or multiple NAS boxes, it is useful to have a means to make the file systems on multiple servers or devices look…
312. global group A collection of user accounts in a Windows NT domain that are members of the domain in which the global group is defined.
313. GMR (Giant MagnetoResistive Head) has great sensitivity to magnetic fields from the disk, making it possible to detect smaller recorded bits and to read these bits at higher data rates.
314. group (also referred to as a Technology Center or TC) - a unit of several Group Art Units in the mechanical, electrical, chemical or design area, managed by one…
315. group ID (GID) The number used by UNIX systems to identify groups.
316. H release Hardware-specific release. A software product that is restricted to run on an identified platform or subset of platforms.
317. HA Higher Authority.
318. HA (High Availability) A combination of technology, processes, and support partnerships that provide greater application or system availability.
319. halt To stop, in an orderly manner, all activity in a computer system.
320. hang When a computer freezes waiting for an event that will never occur.
321. HBA Host Bus Adapter. Any hardware bridge between a storage interconnect and a system's I/O bus.
322. HBA (Host Bus Adapter) "Host Bus Adapter", connects a host system (the computer) toother network and storage devices.
323. HCD (Hardware Configuration Definition) an interactive interface that enables an installation to define I/O configurations to both the software and hardware from one interface.
324. HDA (Head/Disk Assembly) a sealed Winchester assembly, including disks, heads, filter and actuator assembly.
325. HDD (Hard Disk Drive) , also called a Winchester drive, is a spinning magnetic disk accessed by a flying head.
326. Head The upper horizontal part of a window frame or window opening.
327. Head clog Debris trapped in the playback head of a video recorder. Clogging of the playback head with debris causes dropouts.
328. heartbeat A repeating signal transmitted from one appliance to another that indicates that the appliance is in operation.
329. heartbeat network A network that provides reliable communication among nodes in a cluster, including the transmission of heartbeat messages, signals from each functioning…
330. Helical scan recording The recording format in which a slow moving tape is helically wrapped 180° around a rapidly rotating drum with a small embedded record head.
331. Heterogeneous Network A network that includes computers and other devices that run different operating systems.
332. High Availability A continuously available computer system is characterized as having essentially no downtime in any given year. A system with 99.
333. high availability (HA) NetApp support for failover; that is, one appliance assuming the identity and duties of a failed appliance.
334. host In a network, the central computer which controls the remote computers and holds the central databases.
335. host bus adapter (HBA) Any hardware bridge between a storage interconnect and a system's I/O bus.
336. HostRAID Adaptec's integrated RAID feature that allows our Ultra320 controllers to provide maximum storage capacity for integrated RAID solutions: four hard disk…
337. Hot Plug / Hot Swap The ability to install or remove components of a computer, whileit is operating.
338. Hot Spare A spare hard drive which will automatically be used to replace the failed member of a redundant disk array.
339. hot swap The ability to remove a failed member of a redundant disk array and replace it with a good drive without bringing down the server or interrupting…
340. HSC (Host Software Component) the StorageTek software component that maintains, in a DASD control data set (CDS), records of the cartridges stored in each automated cartridge system…
341. HSM (Hierarchical Storage Management) software that automatically migrates unreferenced data sets from expensive, high-speed storage media, such as DASD, to progressively cheaper, less…
342. HTTPS HTTP layered over the SSL protocol.
343. Hydrolysis A chemical reaction that uses water to break down a compound.
344. Hygroscopic Absorbing or attracting moisture from the air.
345. I.C.E. (Instant Capacity Expansion) A GuardianOS Snap Server feature that allows volumes to be instantly expanded and provisioned non-disruptively without degrading performance or having to…
346. I/O (Input/Output) An operation, program, or device that enters data into or extracts data from a computer.
347. IBG (InterBlock Gap) the space left unused between consecutive data blocks.
348. iCAP Internet Content Adaptation Protocol. A high-level protocol that provides a common format for requesting services from a server.
349. ICP (1) Interface Change Proposal. (2) Inventory Control Point (ILS term). (3) Interface Change Proposal. (4) Interface Control Process.
350. ICRC (Improved Cartridge Recording Capability) StorageTek's compression algorithm, that provides about 3:1 data compression on tape.
351. IDRC (Improved Data Recording Capability) IBM's compression algorithm, that provides about 3:1 data compression on tape. Sometimes called Compact.
352. If-Modified-Since (IMS) A query that NetCache sends to a Web server in order to verify the freshness of an object, that is, to determine whether the object has been modified.
353. iFCP Internet Fibre Channel Protocol. A proposed IETF protocol for connecting Fibre Channel devices over an IP network.
354. IIS International Institute for Strategic Studies (UK).
355. ILM (Information Lifecycle Management) The process of managing information growth, storage, and retrieval over time, based on its value to the organization.
356. IMS Integrated Master Schedule.
357. increment chain A series of incremental backups of the same path.
358. Initiator The entity that initiates an authentication exchange.
359. Internet Cache Protocol (ICP) The method by which a hierarchy of NetCache appliances communicate with each other.
360. Internet Content Adaptation Protocol (iCAP) A high-level protocol that provides a common format for requesting services from a server.
361. Internet Information Server (IIS) Web server software developed by Microsoft.
362. interrupt switch A switch on the front panels of some NetApp appliances that is used for debugging purposes.
363. IODF (Input/Output Definition File) where IBM stores hardware and software configurations.
364. IOPS (Inputs/Outputs per second) a measure of performance for a host-attached storage device or RAID controller.
365. IP Address A string of four numbers separated by periods used to represent a computer on the Internet.
366. IP SAN A Storage Area Network (SAN) created using the Internet SCSI (iSCSI) protocol to connect over a Gigabit Ethernet network.
367. IPL Integrated Priority List.
368. iSCSI (Internet SCSI) Small Computer System Interface protocol over an IP network.Unlike other network storage protocols, such as Fibre Channelwhich is the foundation of most…
369. iSCSI Initiator A hardware or software client-side protocol that opens the communication with an iSCSI target server in an IP SAN.
370. iSCSI Target The storage server that receives commands from the iSCSI intiator.
371. ISMF (Interactive Storage Management Facility) the interactive interface of DFSMS/MVS that allows users and storage administrators access to storage management functions.
372. JBOD Just a Bunch Of Disks. An array of disks without any redundancy, that is, without RAID configuration.
373. JBOD (Just a Bunch Of Disks) "Just a Bunch OF Disks", used to refer to hard disks that aren'tconfigured according to RAID.
374. Kb (Kilobit) One thousand bits. Unit of measure for data transfer.
375. KB (Kilobyte) 1,024 bytes. Unit of measure for computer storage.
376. Kbps Kilobyte per second.
377. keepalive A network option that detects inactivity on a client-server connection and, if detected, terminates the connection.
378. kilobit (Kb) One thousand bits. Unit of measure for data transfer.
379. Kilobyte A unit of information or computer storage equal to 1,024 Bytes.Abbreviated K, Kb, Kbyte, and kB.
380. Kilobyte (Kb) Approximately one thousand bytes of data is 1Kb of data.
381. LAN (Local Area Network) A network of computers that generally spans a small area, such as a single building.
382. LANE LAN Emulation. The architecture, protocols, and services that allow ATM-connected end systems to use the ATM network as if it were a LAN.
383. LCU (Library Control Unit) connects a StorageTek tape robotic unit to a Library Management Unit (LMU) and controls the robot movement.
384. LDAP A protocol for accessing directory information. LDAP or Lightweight Directory Access Protocol is used by browsers and email clients to look up email…
385. LFS Loral Federal System, Gaithersburg, MD.
386. Lightweight Directory Access Protocol (LDAP) An industry-standard protocol established by the Internet Engineering Task Force (IETF) that allows users to query and update information in a directory…
387. little-endian A common difference between machines is the order in which they store the individual bytes of multi-byte numerical data.
388. live stream A streaming media presentation that occurs in real time.
389. LMU (Library Management Unit) the StorageTek control path to the host, that can manage up to 16 robotic tape units.
390. load balancer A load balancer is a combination of a DNS name and a set of ports, which together provide a destination for all requests intended for your application.
391. Load Balancing Referring to the ability to redistribute load (read/write requests) to an alternate path between server and storage device, load balancing helps to…
392. local cluster A cluster located in a single data center. This type of cluster is not disaster tolerant.
393. local failover Failover on the same node; this most often applied to hardware failover, for example local LAN failover is switching to the secondary LAN card on the same…
394. local filer The filer you are logged in to.
395. Local Group A small cluster of more than 30 galaxies "near" to our galaxy, including the Andromeda galaxy and the Magellanic Clouds.
396. log-structured file system (LFS) A file system that avoids both multiple-write and synchronous-write problems by batching large numbers of writes into large, contiguous writes.
397. logical data replication A type of on-line data replication that replicates logical transactions that change either the filesystem or the database.
398. Logical Unit Number (LUN) A logical unit of storage.
399. Longitudinal recording A recording format in which a slow or fast moving tape is passed by a stationary recording head.
400. LSM (Library Storage Module) a tape library containing cells (or slots or bins) in which cartridges are stored, usually for access by an automated cartridge system. See ACS.