Grass Valley K2 Level 2 RAID Oct.10 2006 - Manual (Page 63)

September 8, 2006 Level 2 RAID Instruction Manual 63
Glossary
The terms and definitions listed below are related to the storage system described in
this manual. Understanding them will aid your understanding of the storage system.
ALPA (arbitrated loop physical address)
An 8-bit address that uniquely identifies a device on an FC loop.
bind
In the context of a disk-array storage system, the procedure by which you
hardware-format one or more disk modules into one LUN (logical unit) - usually as
one of several types of RAID group.
BTU (British Thermal Unit)
A standard measure of a device’s heat output.
cache
See storage-system caching.
CA (chassis address)
A number, set to 0 on a RAID chassis, that helps establish a unique address for each
disk module on an FC-AL loop. You must set the CA on each RAID Expansion
Chassis. Since the RAID chassis CA is 0, set the Expansion Chassis CA to 1.
disk-drive module
Another name for disk module.
disk unit
A short name for physical disk unit.
disk module
A self-contained disk drive that slides into one of the slots in the front of the storage
system. It consists of the carrier assembly, which holds the disk drive and the
regulator board. Also called disk-drive module.
DIMM (dual in-line memory module)
A type of memory module used in RC memory for write caching or RAID 3 memory.
EMI (electromagnetic interference)
Electronic radiation emitted by an electrical device. The levels of EMI are strictly
controlled for data processing equipment. The EMI standards are explained after the
Notice page near the beginning of the manual.
ESD (electrostatic discharge)
The discharge of an accumulated electrical charge (static). This can severely damage
delicate electronic circuits and you should take steps to prevent this, as explained in
the Chapter 3, “Servicing the PFR 600 Series RAID”.
FC-AL (Fibre Channel arbitrated loop)
An arrangement of Fibre Channel stations such that messages pass from one to the
next in a ring.