disk drive
enclosure
A unit that holds storage system devices such as disk drives, power supplies,
fans, I/O modules, and transceivers.
disk failure
protection
A method by which a controller pair reserves drive capacity to take over the
functionality of a failed or failing physical disk. For each disk group, the
controllers reserve space in the physical disk pool equivalent to the selected
number of physical disk drives.
disk group A physical disk drive set or pool in which a virtual disk is created. A disk group
may contain all the physical disk drives in a controller pair array or a subset of
the array.
disk migration
state
A physical disk drive operating state. A physical disk drive can be in a stable
or migration state:
• Stable—The state in which the physical disk drive has no failure nor is a
failure predicted.
• Migration—The state in which the disk drive is failing, or failure is predicted
to be imminent. Data is then moved off the disk onto other disk drives in the
same disk group.
disk replacement
delay
The time that elapses a drive failure and when the controller starts searching for
spare disk space. Drive replacement seldom starts immediately in case the
“failure” was a glitch or temporary condition.
drive blank See disk drive blank.
dual-loop A configuration where each drive is connected to a pair of controllers through
two loops. These two Fibre Channel loops constitute a loop pair.
dual power supply
configuration
See redundant power configuration.
dynamic capacity
expansion
A storage system feature that provides the ability to increase the size of an
existing virtual disk. Before using this feature, you must ensure that your operating
system supports capacity expansion of a virtual disk (or LUN).
EIA Electronic Industries Alliance. A standards organization specializing in the
electrical and functional characteristics of interface equipment.
EIP Event Information Packet. The event information packet is an HSV element
hexadecimal character display that defines how an event was detected. Also
called the EIP type.
electromagnetic
interference
See EMI.
electrostatic
discharge
See ESD.
element In the Open SAN Manager, a controllable object, such as the Enterprise storage
system.
HP Command
View EVA GUI
The graphical user interface (GUI) through which a user can control and monitor
a storage system. HP Command View EVA can be installed on more than one
storage management server in a fabric. Each installation is a management agent.
The client for the agent is a standard browser.
Glossary112
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