HA (High Availability)A combination of technology, processes, and support partnerships that provide greater application or system availability.
haltTo stop, in an orderly manner, all activity in a computer system.
hangWhen a computer freezes waiting for an event that will never occur.
HBAHost Bus Adapter. Any hardware bridge between a storage interconnect and a system's I/O bus.
HBA (Host Bus Adapter)"Host Bus Adapter", connects a host system (the computer) toother network and storage devices.
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.
HDA (Head/Disk Assembly)a sealed Winchester assembly, including disks, heads, filter and actuator assembly.
HDD (Hard Disk Drive), also called a Winchester drive, is a spinning magnetic disk accessed by a flying head.
HeadThe upper horizontal part of a window frame or window opening.
Head clogDebris trapped in the playback head of a video recorder. Clogging of the playback head with debris causes dropouts.
heartbeatA repeating signal transmitted from one appliance to another that indicates that the appliance is in operation.
heartbeat networkA network that provides reliable communication among nodes in a cluster, including the transmission of heartbeat messages, signals from each functioning…
Helical scan recordingThe recording format in which a slow moving tape is helically wrapped 180° around a rapidly rotating drum with a small embedded record head.
Heterogeneous NetworkA network that includes computers and other devices that run different operating systems.
High AvailabilityA continuously available computer system is characterized as having essentially no downtime in any given year. A system with 99.
high availability (HA)NetApp support for failover; that is, one appliance assuming the identity and duties of a failed appliance.
hostIn a network, the central computer which controls the remote computers and holds the central databases.
host bus adapter (HBA)Any hardware bridge between a storage interconnect and a system's I/O bus.
HostRAIDAdaptec's integrated RAID feature that allows our Ultra320 controllers to provide maximum storage capacity for integrated RAID solutions: four hard disk…
Hot Plug / Hot SwapThe ability to install or remove components of a computer, whileit is operating.
Hot SpareA spare hard drive which will automatically be used to replace the failed member of a redundant disk array.
hot swapThe 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…
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…
HSM (Hierarchical Storage Management)software that automatically migrates unreferenced data sets from expensive, high-speed storage media, such as DASD, to progressively cheaper, less…