Storage definitions beginning with D

DAFS - permalink - collapse

All > Technology > Storage

Direct Access File System. A file system based on virtual interface (VI) architecture, designed for narrow-sharing environments, that is, environments where the machines that are sharing data are only a few yards apart. DAFS bypasses the kernel and transfers data directly from a NIC to a buffer that can be used by an application.
NetApp - Cite This Source - This Definition
Browse Related Terms: Direct Access File System (DAFS), edge device, NIC (Network Interface Card), switch, VI (Virtual Interface), virtual interface (VI)

DAFS (Direct Access File System) - permalink - collapse

All > Technology > Storage

An acronym for Direct Access File System, a new file access protocol designed to take advantage of standard memory-to-memory interconnect technologies
HP - Cite This Source - This Definition
"Direct Access File System" is a network file system similar toNFS and CIFS that allows applications to transfer data whilebypassing operating system control, network protocol andbuffering operations that can bottleneck throughput thusdegrading performance.
Abtech Systems - Cite This Source - This Definition
Browse Related Terms: active file system, DOS attributes, File Data, File server, Global File System, mount, NT file system (NTFS), NTFS, Snapshot, Snapshot Technology, special device file, unmount, widelink

Daisy Chain - permalink - collapse

All > Technology > Storage

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 SCSI card.
Adaptec - Cite This Source - This Definition
Browse Related Terms: ASPI (Advanced SCSI Programming Interface), ASPI Manager, ASPI Module, Asynchronous Data Transfer, channel, DMA (Direct Memory Access), LVD (Low Voltage Differential), Packet Protocol/Packetized SCSI, QAS (Quick Arbitration Select), SCSI address, SCSI Bus, SCSI Device, SCSI ID, SCSI (Small Computer System Interface), Wide SCSI

DAR - permalink - collapse

All > Technology > Storage

Direct Access Restore. A process by which select data is restored from an NDMP tape backup device to the filer.
NetApp - Cite This Source - This Definition
Browse Related Terms: Backup/Restore, direct access restore (DAR), I.C.E. (Instant Capacity Expansion), restoration, resynchronization

DASD (Direct-Access Storage Device) - permalink - collapse

All > Technology > Storage

generic nomenclature for a storage peripheral that can respond directly to random requests for information; usually denotes a disk drive.
Sysprog.Net - Cite This Source - This Definition
Browse Related Terms: Archival storage, cache, device driver, Nearline Storage, SAF-TE (SCSI Accessed Fault-Tolerant Enclosure), single system high availability, SSD (Solid State Disk), Storage Array, Storage Controller, Tiered Storage

DAS (Direct Attached Storage) - permalink - collapse

All > Technology > Storage

DAS is storage that is directly connected to a server by connectivity media such as parallel SCSI cables. This direct connection provides fast access to the data; however, storage is only accessible from that server. DAS include the internally attached local disk drives or externally attached RAID (redundant array of independent disks) or JBOD (just a bunch of disks). Although Fibre Channel can be used for direct attached, it is more commonly used in storage area networks.
Microsoft - Cite This Source - This Definition
An acronym for Direct Attached Storage, those parts of a Wide Area Network in which the mass storage devices are connected locally
HP - Cite This Source - This Definition
Storage that is directly connected to a server.
Adaptec - Cite This Source - This Definition
"Direct Attached Storage" a digital storage system directlyattached to a server or workstation without a storage network inbetween. Mainly used to differentiate non-networked storagefrom SAN and NAS.
Abtech Systems - Cite This Source - This Definition
Browse Related Terms: ATA (Advanced Technology Attachment), Multipathing, Parallel Technology, Point-to-Point, port, SAN, SAS (Serial Attached SCSI), SATA (Serial ATA), Serial Technology, SSA (Serial Storage Architecture), Storage Area Network (SAN), Storage director

database replication - permalink - collapse

All > Technology > Storage

A software-based logical data replication scheme that is offered by most database vendors.
HP - Cite This Source - This Definition
Browse Related Terms: asynchronous data replication, Asynchronous Replication, Bandwidth Throttling, data replication, disaster tolerant, filesystem replication, logical data replication, off-line data replication., on-line data replication, Replication, synchronous data replication, Synchronous Replication, WAN data replication solutions

Data Center - permalink - collapse

All > Technology > Storage

A physically proximate collection of nodes and disks, usually all in one room.
HP - Cite This Source - This Definition
Browse Related Terms: DBN, disk block number (DBN), quota, tree quota, zero

Also listed in

All > Technology > Parallel Computing > Grid Computing
All > Technology > Virtualization

data consistency - permalink - collapse

All > Technology > Storage

Whether data are logically correct and immediately usable; the validity of the data after the last write. Inconsistent data, if not recoverable to a consistent state, is corrupt.
HP - Cite This Source - This Definition
Browse Related Terms: consistency point (CP), CP, dump, Restore, VIF

data currency - permalink - collapse

All > Technology > Storage

Whether the data contain the most recent transactions, and/or whether the replica database has all of the committed transactions that the primary database contains; speed of data replication may cause the replica to lag behind the primary copy, and compromise data currency.
HP - Cite This Source - This Definition
Browse Related Terms: assertion failure, data loss, data recoverability, OLTP (Online Transaction Processing), rolling disaster, TPM (Transaction Processing Monitor)

DataFabric - permalink - collapse

All > Technology > Storage

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 infrastructure that provides a wide range of data accessibility and management services. Developed by Network Appliance.
NetApp - Cite This Source - This Definition
Browse Related Terms: Account Migrator Service (AMS), AMS, ApplianceWatch, Data ONTAP, NetCache, NetCache appliance, NetCache Manager, NTAP, NVFAIL, ONTAP, SecureAdmin, SnapCopy, SnapManager for Exchange, SnapMirror, SnapRestore, WAFL, Write Anywhere File Layout (WAFL)

data loss - permalink - collapse

All > Technology > Storage

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, non-committed transactions that were rolled back as pat of a recovery process, data in the process of being replicated that never made it to the replica because of a failure, transactions that were committed after the last tape backup when a failure occurred that required a reload from the last tape backup. transaction processing monitors (TPM), message queuing software, and synchronous data replication are measures that can protect against data loss.
HP - Cite This Source - This Definition
Browse Related Terms: assertion failure, data currency, data recoverability, OLTP (Online Transaction Processing), rolling disaster, TPM (Transaction Processing Monitor)

data mirroring - permalink - collapse

All > Technology > Storage

See mirroring.
HP - Cite This Source - This Definition
Browse Related Terms: mirrored data, Mirroring

Data ONTAP - permalink - collapse

All > Technology > Storage

A software product designed exclusively for NetApp appliances that optimizes file service by combining patented file-system technology and a microkernel design dedicated to network data access. Developed by Network Appliance.
NetApp - Cite This Source - This Definition
Browse Related Terms: Account Migrator Service (AMS), AMS, ApplianceWatch, DataFabric, NetCache, NetCache appliance, NetCache Manager, NTAP, NVFAIL, ONTAP, SecureAdmin, SnapCopy, SnapManager for Exchange, SnapMirror, SnapRestore, WAFL, Write Anywhere File Layout (WAFL)

data recoverability - permalink - collapse

All > Technology > Storage

The ability to take action that results in data consistency, for example database rollback/roll forward recovery.
HP - Cite This Source - This Definition
Browse Related Terms: assertion failure, data currency, data loss, OLTP (Online Transaction Processing), rolling disaster, TPM (Transaction Processing Monitor)

data replication - permalink - collapse

All > Technology > Storage

The scheme by which data is copied from one site to another for disaster tolerance. Data replication can be either physical (see physical data replication) or logical (see logical data replication). In a Continentalclusters environment, the process by which data that is used by the cluster packages is transferred to the Recovery Cluster and made available for use on the Recovery Cluster in the event of a recovery.
HP - Cite This Source - This Definition
Browse Related Terms: asynchronous data replication, Asynchronous Replication, Bandwidth Throttling, database replication, disaster tolerant, filesystem replication, logical data replication, off-line data replication., on-line data replication, Replication, synchronous data replication, Synchronous Replication, WAN data replication solutions

Also listed in

All > Technology > Records Management

DB - permalink - collapse

All > Technology > Storage

See decibel.
Council on Library and Information Resources - Cite This Source - This Definition
Browse Related Terms: Binary number, Bit, Decibel, Polymer, Unicode, UTF

Also listed in

All > Technology > Defense
All > Technology > Telecommunications

DBN - permalink - collapse

All > Technology > Storage

Disk Block Number. A number that identifies a block of data on a disk.
NetApp - Cite This Source - This Definition
Browse Related Terms: Data Center, disk block number (DBN), quota, tree quota, zero

DC - permalink - collapse

All > Technology > Storage

Domain Controller. 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 with NTFS-style security. A given domain has one primary domain controller (PDC) and optionally one or more backup domain controllers (BDCs).
NetApp - Cite This Source - This Definition
Browse Related Terms: Backup Domain Controller (BDC), BDC, domain controller (DC), global group, local group, NT domain, PDC, Workgroup

Also listed in

All > Technology > Defense
All > Technology > Telecommunications

Decibel - permalink - collapse

All > Technology > Storage

The unit of measure used to indicate relative changes in signal intensity or sound volume. The actual expression for calculating the difference in decibels between signal A and signal B is:
decibel (dB) = 20·logbase10 (signal A amplitude/signal B amplitude)
+6 dB represents a doubling of the signal or a 100% increase
+5 dB represents a 78% increase
+4 dB represents a 58% increase
+3 dB represents a 41% increase
+2 dB represents a 26% increase
+1 dB represents a 12% increase
+0 dB represents no change-signals are equal
-1 dB represents a 11% decrease
-2 dB represents a 21% decrease
-3 dB represents a 29% decrease
-4 dB represents a 37% decrease
-5 dB represents a 44% decrease
-6 dB represents a halving of the signal or a 50% decrease
Council on Library and Information Resources - Cite This Source - This Definition
Browse Related Terms: Binary number, Bit, DB, Polymer, Unicode, UTF

Also listed in

All > Science > Water
All > Technology > Telecommunications

Pages: 1 2 3

Storage (941) : A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #

ExpertGlossary

DAFS - permalink - collapse

DAFS (Direct Access File System) - permalink - collapse

Daisy Chain - permalink - collapse

DAR - permalink - collapse

DASD (Direct-Access Storage Device) - permalink - collapse

DAS (Direct Attached Storage) - permalink - collapse

database replication - permalink - collapse

Data Center - permalink - collapse

data consistency - permalink - collapse

data currency - permalink - collapse

DataFabric - permalink - collapse

data loss - permalink - collapse

data mirroring - permalink - collapse

Data ONTAP - permalink - collapse

data recoverability - permalink - collapse

data replication - permalink - collapse

DB - permalink - collapse

DBN - permalink - collapse

DC - permalink - collapse

Decibel - permalink - collapse

Storage Expert Links