HP 6100 User Manual page 170

controller A hardware/firmware device that manages communications between host systems and other
devices. Controllers typically differ by the type of interface to the host and provide functions
beyond those the devices support.
controller A unit that holds one or more controllers, power supplies, blowers, cache batteries, transceivers,
enclosure and connectors.
controller event A significant occurrence involving any storage system hardware or software component reported
by the controller to HP Command View EVA.
controller fault An amber fault indicator that illuminates on the controller OCP to indicate when there is an HSV
indicator Controller fault.
controller pair Two interconnected controller modules which together control the disk enclosures in the storage
system.
corrective action See CAC.
code
CRITICAL Condition A drive enclosure EMU condition that occurs when one or more drive enclosure elements have
failed or are operating outside of their specifications. The failure of the element makes continued
normal operation of at least some elements in the enclosure impossible. Some enclosure elements
may be able to continue normal operations. Only an UNRECOVERABLE condition has precedence.
This condition has precedence over NONCRITICAL errors and INFORMATION condition.
CRU Customer Replaceable Unit. A storage system element that a user can replace without using
special tools or techniques, or special training.
customer See CRU.
replaceable unit
D
data entry mode The state in which controller information can be displayed or controller configuration data can
be entered. On the Enterprise Storage System, the controller mode is active when the LCD 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 An HSV Controller OCP display that permits a user to view detailed information about a controller
View 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 physical disk drive array through
the Fibre Channel drive enclosure. Also called a device-side port.
device-side ports See device ports.
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 size 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 complement of storage devices.
disk failure A method by which a controller pair reserves drive capacity to take over the functionality of a
protection 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 A physical disk drive operating state. A physical disk drive can be in a stable or migration state:
state
170 Glossary
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.