What do cluster environments use to identify node failures?
A.
SNMP community strings
B.
heartbeats
C.
OSPF link state advertisements
D.
network interface driver diagnostics
Explanation:
What Happens when a Node Times Out
Each node sends a heartbeat message to the cluster coordinator every HEARTBEAT_INTERVAL number of
microseconds (as specified in the cluster configuration file). The cluster coordinator looks for this message from
each node, and if it does not receive it within NODE_TIMEOUT microseconds, the cluster is reformed minus
the node no longer sending heartbeat messages.
On a node that is not the cluster coordinator, and on which a node timeout occurs (that is, no heartbeat
message has arrived within NODE_TIMEOUT seconds), the following sequence of events occurs:
The node tries to reform the cluster.
If the node cannot get a quorum (if it cannot get the cluster lock) then
The node halts (system reset).
http://docstore.mik.ua/manuals/hp-ux/en/B3936-90122/ch03s07.html
is corret is A
Active Health System assists in diagnosing
problems and delivering rapid resolution when server failures occur. The Active Health System
log, together with the system monitoring provided by Agentless Management or Simple Network
Management Protocol (SNMP)
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