HP Serviceguard Metrocluster manual Or system availability

G
gatekeeper	A small EMC Symmetrix device configured to function as a lock during certain state change
	operations.
H, I
high availability	A combination of technology, processes, and support partnerships that provide greater application
	or system availability.
J, K, L
local cluster	A cluster located in a single data center. This type of cluster is not disaster recovery.
local failover	Failover on the same node; this most often applied to hardware failover, For Example local LAN
	failover is switching to the secondary LAN card on the same node after the primary LAN card
	has failed.
logical data	A type of on-line data replication that replicates logical transactions that change either the
replication	filesystem or the database. Complex transactions might result in the modification of many diverse
	physical blocks on the disk.
M
Maintenance mode	A recovery group is in the maintenance mode when it is disabled. The cmrecovercl
	-dcommand moves a recovery group is moved into maintenance mode. The cmrecovercl -e
	command moved the recovery group out of the maintenance mode. When a recovery group is
	in the maintenance mode, recovery is not allowed.
manual failover	Failover requiring human intervention to start an application or service on another node.
mirrored data	Data that is copied using mirroring.
mirroring	Disk mirroring hardware or software, such as MirrorDisk/UX. Some mirroring methods might
	allow splitting and merging.
multiple system	Cluster technology and architecture that increases the level of availability by grouping systems
high availability	into a cooperative failover design.
mutual recovery	Continentalclusters configuration in which every cluster serves the roles of primary and recovery
configuration	cluster for different recovery groups. Also known as a bi-directional configuration.
N
network failover	The ability to restore a network connection after a failure in network hardware when there are
	redundant network links to the same IP subnet.
notification	A message that is sent following a cluster or package event.
O
off-line data	Data replication by storing data off-line, usually a backup tape or disk stored in a safe location;
replication.	this method is best for applications that can accept a 24-hour recovery time.
on-line data	Data replication by copying to another location that is immediately accessible. On-line data
replication	replication is usually done by transmitting data over a link in real time or with a slight delay to
	a remote site; this method is best for applications requiring quick recovery (within a few hours
	or minutes).
P
package alert	Time at which a message is sent indicating a problem with a package.
package event	A package condition such as a failure that causes a notification message to be sent. Package
	events can be accompanied by alerts, but not alarms. Messages are for information only; the
	cmrecovercl command is not enabled for a package event.

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