HP 6400/8400, User Manual

Page: 133 / 150

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 between 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 .
drive enclosure See drive enclosure .
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 a drive enclosure, a device such as an EMU, power supply, disk, blower,
or I/O module. The object can be controlled, interrogated, or described by
the enclosure services process. 1.
2. In the Open SAN Manager, a controllable object, such as the Enterprise
storage system.
HP Command
View EVA GUI The 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.
HP StorageWorks 6400/8400 Enterprise Virtual Array user guide 133