Compaq ProLiant Cluster HA/F500 Enhanced DT Supplement

Glossary
Glossary-2 ProLiant Cluster HA/F500 for MA8000 Enhanced DT Supplement Guide
COMPAQ CONFIDENTIAL
Writer: Woody Jernigan File Name: w-glossary
Codename: Chargers Part Number: 165103-004 Last Saved On: 7/30/02 9:31 AM
failback
1. The process that takes place when a previously failed controller is repaired or replaced and
reassumes the workload from a companion controller.
2. The process that takes place when the operation of a previously failed cluster group moves
from one cluster node back to its primary node.
failover
1. The process that takes place when one controller in a dual redundant configuration assumes
the workload of a failed companion controller. Failover continues until the failed controller is
repaired or replaced.
2. The process that takes place when the operation of a cluster group moves from one cluster
node to another node in the same cluster.
FDDI
Fibre Distributed Data Interface. A set of ANSI protocols for sending digital data over fiber
optic cable.
host
The primary or controlling computer to which a storage system is attached.
host bus adapter
A device that connects a host system to a SCSI bus. The host bus adapter usually performs
the lowest layers of the SCSI protocol. This function may be logically and physically
integrated into the host system.
initiator site
The location of the primary network.
latency
The amount of time required for a transmission to reach its destination.
local site
The location of the primary network.
logical unit (LUN)
A physical or virtual device addressable through a target ID number. LUNs use the target bus
connection to communicate on the SCSI bus. The host sees a virtual disk as a LUN.