Storage — page 2 of 9

Storage terms

101. campus cluster A single cluster that is geographically dispersed within the confines of an area owned or leased by the organization such that it has the right to run…
102. CAP (Cartridge Access Port) a 20 to 30 cartridge enter/eject facility for a StorageTek robotic tape library. See ECAP.
103. cascading failover Cascading failover is the ability of an application to fail from a primary to a secondary location, and then to fail to a recovery location on a different…
104. CDDI Copper Distributed Data Interface. A version of FDDI that uses UTP wires rather than optical fiber.
105. CDN Content Delivery Network. A network, or that portion of a network, built specifically to speed the delivery of Web-based content across the public…
106. CDS (Control Data Set) an SMS VSAM linear data set containing configurational, operational, or communication information. See SMS.
107. CFO Chief Financial Officer
108. Channel The bed of a stream or river. This can also refer to a submerged stream or river channel in a reservoir.
109. Chassis The shell of the race car itself including the floorboard, interior and roll cage. The chassis is loosely based off of standard manufactured cars.
110. CIDR Configuration Item Design Review.
111. CIFS Common Internet File System. Microsoft's file-sharing protocol that evolved from SMB.
112. CIFS authentication mode The method used for authentication of CIFS users.
113. CIFS cred The credential used to validate requests for files with NT-style security.
114. CIFS share A directory or directory structure that has been made available to network users and can be mapped to a drive letter on a CIFS client.
115. Classless Inter-Domain Routing (CIDR) A type of network routing that uses the network mask instead of the address class to determine the destination network.
116. client Any computer system that requests a service of another computer system. A workstation requesting the contents of a file from a file server is a client of…
117. client reconnect Users access to the backup site after failover. Client reconnect can be transparent, where the user is automatically connected to the application running…
118. cluster Clusters are fixed length blocks of bytes that store data for Microsoft operating systems.
119. cluster alarm Time at which a message is sent indicating that the cluster is probably in need of recovery. The cmrecovercl command is enabled at this time.
120. cluster alert Time at which a message is sent indicating a problem with the cluster.
121. cluster event A cluster condition that occurs when the cluster goes down or enters an UNKNOWN state, or when the monitor software returns an error.
122. Cluster Interconnect A very high-speed connection allowing nodes in a cluster to communicate.
123. cluster monitor Software that administers the relationship of filers in a cluster.
124. cluster quorum A dynamically calculated majority used to determine whether any grouping of nodes is sufficient to start or run the cluster.
125. clustered failover (CFO) Method of ensuring data availability by transferring the data service of a failed filer to another filer in the cluster.
126. Coercivity The level of demagnetizing force that would need to be applied to a tape or magnetic particle to reduce the remanent magnetization to zero.
127. Cohesive force The force that holds a material together. The force that holds a material to itself.
128. Cohesiveness See cohesive force.
129. COLD (Computer Output to Laser Disk) an optical storage technology for transferring data to optical disk for near-online storage.
130. command device A disk area in the HP StorageWorks XP series disk array used for internal system communication.
131. Command Optimization Queuing commands for immediate execution without waiting for responses, which increases RAID performance.
132. Common Internet File System (CIFS) Microsoft's file-sharing protocol that evolved from SMB.
133. Community A political entity that has the authority to adopt and enforce floodplain ordinances for the area under its jurisdiction.
134. consistency group A set of Symmetrix RDF devices that are configured to act in unison to maintain the integrity of a database.
135. consistency point (CP) In Data ONTAP, the time at which data is written to disk.
136. Console A scroll-shaped projecting bracket that supports a horizontal member.
137. content delivery network (CDN) A network, or that portion of a network, built specifically to speed the delivery of Web-based content across the public Internet or private intranets.
138. content provider Any company in the business of aggregating or producing content for delivery via the Internet.
139. continental cluster A group of clusters that use routed networks and/or common carrier networks for data replication and cluster communication to support package failover…
140. Continuous Access A facility provided by the Continous Access software option available with the HP StorageWorks E Disk Array XP series.
141. controller An adapter card, RAID controller, or other module that interprets signals between a host and a eripheral device.
142. Cookie A message given to a Web browser by a Web server. The browser stores the message in a text file.
143. Copper Distributed Data Interface (CDDI) A version of FDDI that uses UTP wires rather than optical fiber.
144. copy-on-write (COW) The technique for creating snapshots without consuming excess disk space.
145. Core (Kor) the central part of anything, such as the central mass of necrotic matter in a boil.
146. core dump The corpse of a "process", in the form of a file left in the "working directory" of the process, usually as a result of certain kinds of fatal error.
147. core file The file that contains the contents of a core dump.
148. COW A radioisotope generator system.
149. CP Command Post.
150. CRC Control and Reporting Center.
151. CRC error Cyclic Redundancy Check error. A type of transmission error that may occur due to faulty network hardware, cabling, network interface cards, switch ports…
152. cred Short for "credential." Access to files and directories is determined by the credentials of the requesting user.
153. Cricket A Web-based system that uses SNMP for monitoring trends in time-series data. See also "MRTG."
154. crossover cable A cable used to interconnect two computers by reversing, or "crossing over," their respective pin contacts.
155. CRU Central Reexamination Unit
156. CST (Cartridge System Tape) a standard length tape cartridge with a nominal uncompressed capacity of approximately 400 Mbytes.
157. CTS (Cartridge Tape Subsystem) forms the data path between the cartridge library and the host system. It includes tape control units and tape cartridge transports.
158. Curvature error A change in track shape that results in a bowed or S-shaped track. This becomes a problem if the playback head is not able to follow the track closely…
159. customer-replaceable unit (CRU) Any field-replaceable unit (FRU) that can be replaced by the customer.
160. cyclic redundancy check (CRC) An error-checking technique that helps ensure accurate transmission of digital data in a network.
161. DAFS Direct Access File System. A file system based on virtual interface (VI) architecture, designed for narrow-sharing environments, that is, environments…
162. DAFS (Direct Access File System) "Direct Access File System" is a network file system similar toNFS and CIFS that allows applications to transfer data whilebypassing operating system…
163. Daisy Chain A cable configuration in which internal and external SCSI devices such as hard drives, CDs, scanners, and tape drives are connected in a series to the…
164. DAR Direct Access Restore. A process by which select data is restored from an NDMP tape backup device to the filer.
165. DAS (Direct Attached Storage) "Direct Attached Storage" a digital storage system directlyattached to a server or workstation without a storage network inbetween.
166. DASD (Direct-Access Storage Device) generic nomenclature for a storage peripheral that can respond directly to random requests for information; usually denotes a disk drive.
167. data center A facility that provides a suitable environment (power, cooling, network connectivity, management services) for housing information technology equipment…
168. data consistency Whether data are logically correct and immediately usable; the validity of the data after the last write.
169. data currency Whether the data contain the most recent transactions, and/or whether the replica database has all of the committed transactions that the primary database…
170. data loss The inability to take action to recover data. Data loss can be the result of transactions being copied that were lost when a failure occurred…
171. data mirroring See mirroring.
172. Data ONTAP A software product designed exclusively for NetApp appliances that optimizes file service by combining patented file-system technology and a microkernel…
173. data recoverability The ability to take action that results in data consistency, for example database rollback/roll forward recovery.
174. data replication process of duplicating data between sites to enable the continued use of data
175. database replication A software-based logical data replication scheme that is offered by most database vendors.
176. DataFabric A suite of products that allow for the clean separation of the data and the service and application layers by enabling IT staff to create a storage…
177. DB Bata Base
178. DBN Disk Block Number. A number that identifies a block of data on a disk.
179. DC See Direct current
180. Decibel A unit for expressing the relative intensity of sounds on a scale from zero for the average least perceptible sound to about 130 for the average level at…
181. degraded mode The operating mode of a NetApp appliance when a disk in the RAID group has failed or the batteries on the NVRAM card are low.
182. DES A synthetic form of the hormone estrogen that was prescribed to pregnant women between about 1940 and 1971 because it was thought to prevent miscarriages.
183. device driver Software that enables hardware or devices (such as a printer, mouse, or keyboard) to work with your computer.
184. DFS Distributed File System. A Windows file management system that allows data scattered across multiple servers to be treated as a single group.
185. DFS (Distributed File System) DFS allows administrators to group shared folders located on different servers by transparently connecting them to one or more DFS namespaces.
186. DHCP dynamic host configuration protocol
187. Differential An electrical signal characteristic which transmits information through a current loop to minimize signal noise and allow the SCSI bus to operate reliably…
188. Digital recording A recording in which binary numbers are written to the tape that represent quantized versions of the voltage signals from the recording microphone or the…
189. Digital-to-analog The process in which a series of discrete binary integers is converted to a continuous analog signal.
190. Direct Access File System (DAFS) A file system based on virtual interface (VI) architecture, designed for narrow-sharing environments, that is, environments where the machines that are…
191. direct access restore (DAR) A process by which select data is restored from an NDMP tape backup device to the filer.
192. Disaster An event that demands a crisis response beyond the scope of any single line agency or service (e.g.
193. disaster protection (Don't use this term?) Processes, tools, hardware, and software that provide protection in the event of an extreme occurrence that causes application…
194. Disaster Recovery The process of restoring access to applications and data after a disaster. Disaster recovery can be manual, meaning human intervention is required, or it…
195. disaster recovery services Services and products offered by companies that provide the hardware, software, processes, and people necessary to recover from a disaster.
196. disaster tolerant The characteristic of being able to recover quickly from a disaster. Components of disaster tolerance include redundant hardware, data replication…
197. disaster tolerant architecture A cluster architecture that protects against multiple points of failure or a single catastrophic failure that affects many components by locating parts of…
198. disk block number (DBN) A number that identifies a block of data on a disk.
199. disk ID number A number assigned by the NetApp appliance to each disk when it probes the disks at boot-up, for example, 8.1.
200. disk scrubbing The process by which the system reads each disk in a RAID group and attempts to fix media errors by rewriting the data to another disk area.