User's Manual

redundancy Element Redundancy—The degree to which logical or physical elements are protected by
having another element that can take over in case of failure. For example, each loop of a
1.
device-side loop pair normally works independently but can take over for the other in case
of failure.
2. Data Redundancy—The level to which user data is protected. Redundancy is directly
proportional to cost in terms of storage usage; the greater the level of data protection, the
more storage space is required.
redundant power
configuration
A capability of the HP Enterprise Storage System racks and enclosures to allow continuous system
operation by preventing single points of power failure.
reporting group An Enterprise Storage System controller pair and the associated disk drive enclosures. The
Enterprise Storage System controller assigns a unique decimal reporting group number to each
EMU on its loops. Each EMU collects disk drive environmental information from its own
sub-enclosure and broadcasts the data over the enclosure address bus to all members of the
reporting group. Information from enclosures in other reporting groups is ignored.
RoHS Reduction of Hazardous Substances.
room temperature See ambient temperature.
RPO Recovery point objective. The maximum age of the data you want the ability to restore in the
event of a disaster. For example, if your RPO is six hours, you want to be able to restore systems
back to the state they were in as of no longer than six hours ago. To achieve this objective, you
need to make backups or other data copies at least every six hours.
S
SCSI-3 The ANSI standard that defines the operation and function of fibre channel systems.
SCSI-3 Enclosure
Services
See SES.
selective
presentation
The process whereby a controller presents a virtual disk only to the host computer which is
authorized access.
serial transmission A method of transmission where each bit of information is sent sequentially on a single channel,
not simultaneously on all channels as occurs in parallel transmission.
SES SCSI-3 Enclosures Services. Those services that establish the mechanical environment, electrical
environment, and external indicators and controls for the proper operation and maintenance of
devices within an enclosure.
SFP Small form-factor pluggable transceiver.
solid state disk
(SSD)
A high-performance storage device that contains no moving parts. SSD components include either
DRAM or EEPROM memory boards, a memory bus board, a CPU, and a battery card.
SSN Storage system name. A unique 20-character name, assigned by HP P6000 Command View,
that identifies a storage system.
storage carrier See carrier.
storage pool The aggregated blocks of available storage in the total physical disk array.
storage system See array.
Storage System
Name
See SSN.
switch An electro-mechanical device that initiates an action or completes a circuit.
T
TC Termination Code. An eight-character hexadecimal display that identifies why controller operations
have halted.
Termination Code See TC.
termination event The occurrences that cause the storage system to cease operation.
terminator Interconnected elements that form the ends of the transmission lines in the enclosure address bus.
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