Novell SUSE LINUX ENTERPRISE SERVER 10 SP2 HEARTBEAT Manual page 183

node
Any computer (real or virtual) that is a member of a cluster and invisible for the
user.
pingd
The ping daemon. It continuously contacts one or more servers outside the cluster
with ICMP pings.
policy engine (PE)
The policy engine computes the actions that need to be taken to implement policy
changes in the CIB. This information is then passed on to the transaction engine,
which in turn implements the policy changes in the cluster setup. The PE always
runs on the DC.
OCF resource agent
OCF resource agents are similar to LSB resource agents (init scripts). Any OCF
resource agent must support start, stop, and status (sometimes called
monitor) options. Additionally, they support a metadata option that returns
the description of the resource agent type in XML. Additional options may be
supported, but are not mandatory. OCF resource agents reside in /usr/lib/
ocf/resource.d/provider. Find more information about OCF resource
agents and a draft of the specification at
OCFResourceAgent
.cgi/specs/ra/resource-agent-api.txt?rev=HEAD.
quorum
In a cluster, a cluster partition is defined to have quorum (is "quorate") if it has the
majority of nodes (or votes). Quorum distinguishes exactly one partition. It is part
of the algorithm to prevent several disconnected partitions or nodes from proceeding
and causing data and service corruption (split brain). Quorum is a prerequisite for
fencing, which then ensures that quorum is indeed unique.
resource
Any type of service or application that is known to Heartbeat. Examples include
an IP address, a file system, or a database.
resource agent (RA)
A resource agent (RA) is a script acting as a proxy to manage a resource. There
are three different kinds of resource agents: OCF (Open Cluster Framework) re-
http://www.linux-ha.org/
and
http://www.opencf.org/cgi-bin/viewcvs
Terminology 175