Compaq ProLiant Clusters HA/F100 Administrator's Manual page 192

Active/active
Active/standby
Arbitrated loop
Array controller
Availability
Blink LEDs
Business-critical
A state in which each host bus adapter is processing
data when the cluster is operating normally.
A state in which one host bus adapter is processing
data and the other is in a booted, but inactive, state
when the cluster is operating normally. The standby
node does not execute its own clustered applications
and has no cluster groups to fail over to the active
node.
A connection method in which two or more ports can
be interconnected, but only two ports at a time can
communicate.
A hardware device that facilitates communications
between a host and one or more devices organized on
an array. Also called RA4000 controller.
A measure of how well a computer system can
continuously deliver services to its clients.
Availability is typically expressed as a percentage,
with 100 percent being the best possible rating.
The ability to light the drive tray LEDs on a particular
RA4000/4100.
Applications that are key to business success but not
significant enough to justify the high cost of a
traditional clustering solution. Their failure causes lost
revenue, decreased productivity, and customer
dissatisfaction.
Glossary