User guide

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Appendix A: Glossary of Terms
Term Description
Backplane A PCB into which the controller plugs
C0 / C1 See Master / Slave
C-C Nexus Controller-to-controller nexus. A configuration of two RAID con-
trollers sharing a common set of drives (see Dual-active mode)
DDA Direct Disk Attach
DRAM Dynamic Random Access Memory
Dual-active Mode A method of interconnecting multiple RAID controllers that share
a common set of drives. In addition to increasing overall perfor-
mance, this method allows a surviving controller to take over
resources of a failed controller. This failover process is transparent
to the host
Duplex See dual-active mode
Fail-over A process whereby a controller puts its partner controller in reset
and assumes its duties
Failed controller A controller that has been determined to be malfunctioning by its
partner
FC_AL Fibre Channel Arbitrated Loop. A direct attachment ANSI archi-
tecture interface that supports a maximum of 126 ports
FCP Fibre Channel Protocol
Hot-plug (Hot Swap) Hot plug refers to removing and inserting a controller
while system power is applied. This can occur while the other
controller in a dual-controller implementation is active