HP StorageWorks Enterprise Virtual Array 3000/5000 User Guide VCS 3.x (5697-5480, March 2006)

data entry mode The state in which controller information can be displayed or controller
configuration data can be entere d. On the Enterprise Storage System, the
controller mode is active when the LC D on the HSV Controller OCP is Flashing.
default disk group The first disk group created at the time the system in initialized. The default
disk group can contain the entire set of physical disks in the array or just a
few of the disks.
See also disk group.
Detailed Fault
View
An HSV Controller OCP display that permits a user to view detailed information
about a controller fault.
device channel A channel used to connect storage devices to a host I/O bus adapter or
intelligent controller.
device ports Controller pair device ports connected to the storage system’s phys ical disk drive
array through the Fibre Channel drive enclosure. Also called a device-side port.
device-side ports See device por ts.
DIMM Dual Inline Memory Module. A small circuit board holding memory chips.
dirty data The write-back cached data that has not been written to storage media even
though the host operation processing the data has completed.
disk drive A carrier-mounted storage device supporting random access to fixed siz e blocks
of data.
disk drive blank A carrier that replaces a disk drive to control airflow within a drive enclosure
whenever there is less than a full com p lem ent of storage devices.
drive enclosure A unit that holds storage system devices such as disk drives, power supplies,
blowers, I/O mo d u les, transceivers, or EMUs.
drive enclosure
event
Asignificant operational occurrence involving a hardware or software
component in the drive enclosure. The drive enclosure EMU reports these events
to the controller for processing.
disk failure pro-
tection
A method by which a controller p air reserves drive cap a city 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
thesamediskgroup.
disk replacement
delay
The time that elapses between a drive failure and when the controller starts
searching for spare disk space. Drive replacement se
ldom starts immediately in
case the “failu re” was a glitch or temporary conditi
on.
drive blank See disk drive blank.
drive enclosure See drive enclosure.
dual-loop Aconfi g uration where each drive is connected to a pair of controllers through
two loops. These two Fibre Channel loops constitute a loop pair.
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Glossary