<s>
Oracle	B-Application
Solaris	I-Application
Cluster	O
(	O
sometimes	O
Sun	B-Operating_System
Cluster	I-Operating_System
or	O
SunCluster	O
)	O
is	O
a	O
high-availability	B-General_Concept
cluster	I-General_Concept
software	O
product	O
for	O
Solaris	B-Application
,	O
originally	O
created	O
by	O
Sun	O
Microsystems	O
,	O
which	O
was	O
acquired	O
by	O
Oracle	B-Application
Corporation	I-Application
in	O
2010	O
.	O
</s>
<s>
Sun	B-Operating_System
Cluster	I-Operating_System
operates	O
by	O
having	O
redundant	O
computers	O
or	O
nodes	O
where	O
one	O
or	O
more	O
computers	O
continue	O
to	O
provide	O
service	O
if	O
another	O
fails	O
.	O
</s>
<s>
Nodes	O
may	O
be	O
located	O
in	O
the	O
same	O
data	B-Operating_System
center	I-Operating_System
or	O
on	O
different	O
continents	O
.	O
</s>
<s>
Solaris	B-Operating_System
Cluster	I-Operating_System
provides	O
services	O
that	O
remain	O
available	O
even	O
when	O
individual	O
nodes	O
or	O
components	O
of	O
the	O
cluster	O
fail	O
.	O
</s>
<s>
Solaris	B-Operating_System
Cluster	I-Operating_System
provides	O
two	O
types	O
of	O
HA	O
services	O
:	O
failover	B-General_Concept
services	I-General_Concept
and	O
scalable	O
services	O
.	O
</s>
<s>
To	O
eliminate	O
single	O
points	O
of	O
failure	O
,	O
a	O
Solaris	B-Operating_System
Cluster	I-Operating_System
configuration	O
has	O
redundant	O
components	O
,	O
including	O
multiple	O
network	O
connections	O
and	O
data	O
storage	O
which	O
is	O
multiply	O
connected	O
via	O
a	O
storage	O
area	O
network	O
.	O
</s>
<s>
Clustering	O
software	O
such	O
as	O
Solaris	B-Operating_System
Cluster	I-Operating_System
is	O
a	O
key	O
component	O
in	O
a	O
Business	O
Continuity	O
solution	O
,	O
and	O
the	O
Solaris	B-Operating_System
Cluster	I-Operating_System
Geographic	O
Edition	O
was	O
created	O
specifically	O
to	O
address	O
that	O
requirement	O
.	O
</s>
<s>
Solaris	B-Operating_System
Cluster	I-Operating_System
is	O
an	O
example	O
of	O
kernel-level	O
clustering	O
software	O
.	O
</s>
<s>
Some	O
of	O
the	O
processes	O
it	O
runs	O
are	O
normal	O
system	O
processes	O
on	O
the	O
systems	O
it	O
operates	O
on	O
,	O
but	O
it	O
does	O
have	O
some	O
special	O
access	O
to	O
operating	O
system	O
or	O
kernel	B-Operating_System
functions	O
in	O
the	O
host	O
systems	O
.	O
</s>
<s>
In	O
June	O
2007	O
,	O
Sun	O
released	O
the	O
source	O
code	O
to	O
Solaris	B-Operating_System
Cluster	I-Operating_System
via	O
the	O
OpenSolaris	B-Operating_System
HA	B-General_Concept
Clusters	I-General_Concept
community	O
.	O
</s>
<s>
It	O
enables	O
two	O
Solaris	B-Operating_System
Cluster	I-Operating_System
installations	O
to	O
be	O
managed	O
as	O
a	O
unit	O
,	O
in	O
conjunction	O
with	O
one	O
or	O
more	O
Data	B-Architecture
replication	I-Architecture
products	O
,	O
to	O
provide	O
Disaster	B-General_Concept
Recovery	I-General_Concept
for	O
a	O
computer	O
installation	O
.	O
</s>
<s>
PxFS	O
(	O
Proxy	O
file	O
system	O
)	O
is	O
a	O
distributed	O
,	O
high	O
availability	O
,	O
POSIX	O
compliant	O
filesystem	O
internal	O
to	O
Solaris	B-Operating_System
Cluster	I-Operating_System
nodes	O
.	O
</s>
<s>
Global	O
devices	O
in	O
Sun	B-Operating_System
Cluster	I-Operating_System
are	O
made	O
possible	O
by	O
PxFS	O
.	O
</s>
<s>
Solaris	B-Operating_System
Cluster	I-Operating_System
uses	O
software	O
components	O
called	O
agents	O
which	O
monitor	O
an	O
application	O
to	O
detect	O
whether	O
it	O
is	O
operating	O
correctly	O
,	O
and	O
take	O
action	O
if	O
a	O
problem	O
is	O
detected	O
.	O
</s>
<s>
Agents	O
for	O
common	O
applications	O
are	O
included	O
such	O
as	O
Siebel	O
Systems	O
,	O
SAP	B-Application
Livecache	O
,	O
WebLogic	B-Language
Server	I-Language
,	O
GlassFish	B-Language
,	O
MySQL	B-Application
,	O
Oracle	B-Operating_System
RAC	I-Operating_System
,	O
Oracle	B-Application
E-Business	I-Application
Suite	I-Application
and	O
Samba	B-Language
among	O
others	O
;	O
there	O
is	O
also	O
a	O
wizard	O
which	O
allows	O
the	O
cluster	O
implementer	O
to	O
create	O
agents	O
for	O
other	O
applications	O
.	O
</s>
