DAFSDirect Access File System. A file system based on virtual interface (VI) architecture, designed for narrow-sharing environments, that is, environments…
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…
Daisy ChainA 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…
DARDirect Access Restore. A process by which select data is restored from an NDMP tape backup device to the filer.
DAS (Direct Attached Storage)"Direct Attached Storage" a digital storage system directlyattached to a server or workstation without a storage network inbetween.
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.
data centerA facility that provides a suitable environment (power, cooling, network connectivity, management services) for housing information technology equipment…
data consistencyWhether data are logically correct and immediately usable; the validity of the data after the last write.
data currencyWhether the data contain the most recent transactions, and/or whether the replica database has all of the committed transactions that the primary database…
data lossThe inability to take action to recover data. Data loss can be the result of transactions being copied that were lost when a failure occurred…
Data ONTAPA software product designed exclusively for NetApp appliances that optimizes file service by combining patented file-system technology and a microkernel…
data recoverabilityThe ability to take action that results in data consistency, for example database rollback/roll forward recovery.
data replicationprocess of duplicating data between sites to enable the continued use of data
database replicationA software-based logical data replication scheme that is offered by most database vendors.
DataFabricA 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…
DecibelA 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…
degraded modeThe operating mode of a NetApp appliance when a disk in the RAID group has failed or the batteries on the NVRAM card are low.
DESA synthetic form of the hormone estrogen that was prescribed to pregnant women between about 1940 and 1971 because it was thought to prevent miscarriages.
device driverSoftware that enables hardware or devices (such as a printer, mouse, or keyboard) to work with your computer.
DFSDistributed File System. A Windows file management system that allows data scattered across multiple servers to be treated as a single group.
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.
DifferentialAn electrical signal characteristic which transmits information through a current loop to minimize signal noise and allow the SCSI bus to operate reliably…
Digital recordingA recording in which binary numbers are written to the tape that represent quantized versions of the voltage signals from the recording microphone or the…
Digital-to-analogThe process in which a series of discrete binary integers is converted to a continuous analog signal.
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…
direct access restore (DAR)A process by which select data is restored from an NDMP tape backup device to the filer.
DisasterAn event that demands a crisis response beyond the scope of any single line agency or service (e.g.
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…
Disaster RecoveryThe process of restoring access to applications and data after a disaster. Disaster recovery can be manual, meaning human intervention is required, or it…
disaster recovery servicesServices and products offered by companies that provide the hardware, software, processes, and people necessary to recover from a disaster.
disaster tolerantThe characteristic of being able to recover quickly from a disaster. Components of disaster tolerance include redundant hardware, data replication…
disaster tolerant architectureA cluster architecture that protects against multiple points of failure or a single catastrophic failure that affects many components by locating parts of…
disk ID numberA number assigned by the NetApp appliance to each disk when it probes the disks at boot-up, for example, 8.1.
disk scrubbingThe 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.
disk shelfA storage unit that contains disk drives.
Distributed File System (DFS)A Windows file management system that allows data scattered across multiple servers to be treated as a single group.
DLT (Digital Linear Tape)A type of backup tape which can hold up to 80 GB depending on the data file format.
DNS cachingA method for preventing unnecessary DNS lookups by caching DNS tables locally.
domain controller (DC)A computer running NT Server that is contacted when a request comes in to log in a CIFS client or validate a request from an NFS client accessing a file…
Domain Name System (DNS)Hierarchical distributed database used for name/address translation and client-server rendezvous.
DOS attributesAccess classifications associated with all DOS files. Typical attributes are read only, archive, hidden, and system.
DropoutBrief signal loss caused by a tape head clog, defect in the tape, debris, or other feature that causes an increase in the head-to-tape spacing.
dumpNoun. A backup to tape, created using the Data ONTAP dump command.
dump pathA path that specifies one volume, qtree, or subtree to back up.