<s>
A	O
cluster-aware	B-Operating_System
application	I-Operating_System
is	O
a	O
software	B-Application
application	I-Application
designed	O
to	O
call	O
cluster	O
APIs	B-Application
in	O
order	O
to	O
determine	O
its	O
running	O
state	O
,	O
in	O
case	O
a	O
manual	O
failover	B-General_Concept
is	O
triggered	O
between	O
cluster	O
nodes	O
for	O
planned	O
technical	O
maintenance	O
,	O
or	O
an	O
automatic	O
failover	B-General_Concept
is	O
required	O
,	O
if	O
a	O
computing	B-Architecture
cluster	I-Architecture
node	O
encounters	O
hardware	O
or	O
software	O
failure	O
,	O
to	O
maintain	O
business	O
continuity	O
.	O
</s>
<s>
A	O
cluster-aware	B-Operating_System
application	I-Operating_System
may	O
be	O
capable	O
of	O
failing	O
over	O
LAN	B-General_Concept
or	O
WAN	O
.	O
</s>
<s>
Use	O
TCP/IP	B-Protocol
to	O
maintain	O
heartbeat	O
between	O
nodes	O
.	O
</s>
<s>
Capable	O
of	O
transaction	B-General_Concept
processing	I-General_Concept
.	O
</s>
