<s>
The	O
Linux-HA	B-Operating_System
(	O
High-Availability	B-General_Concept
Linux	B-Application
)	O
project	O
provides	O
a	O
high-availability	B-General_Concept
(	O
clustering	B-Architecture
)	O
solution	O
for	O
Linux	B-Application
,	O
FreeBSD	B-Operating_System
,	O
OpenBSD	B-Operating_System
,	O
Solaris	B-Application
and	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
which	O
promotes	O
reliability	O
,	O
availability	O
,	O
and	O
serviceability	O
(	O
RAS	O
)	O
.	O
</s>
<s>
The	O
project	O
's	O
main	O
software	O
product	O
is	O
Heartbeat	B-Operating_System
,	O
a	O
GPL-licensed	O
portable	O
cluster	O
management	O
program	O
for	O
high-availability	B-General_Concept
clustering	B-Architecture
.	O
</s>
<s>
several	O
resource	O
scripts	O
(	O
for	O
Apache	B-Application
,	O
IBM	B-Application
Db2	I-Application
,	O
Oracle	B-General_Concept
,	O
PostgreSQL	B-Application
etc	O
.	O
)	O
</s>
<s>
Eventually	O
Harald	O
Milz	O
wrote	O
an	O
odd	O
sort	O
of	O
Linux-HA	B-Operating_System
HOWTO	O
.	O
</s>
<s>
Unlike	O
most	O
HOWTOs	O
,	O
this	O
was	O
not	O
about	O
how	O
to	O
configure	O
or	O
use	O
existing	O
software	O
,	O
it	O
was	O
a	O
collection	O
of	O
HA	O
techniques	O
which	O
one	O
could	O
use	O
if	O
one	O
were	O
to	O
write	O
HA	O
software	O
for	O
Linux	B-Application
.	O
</s>
<s>
This	O
release	O
represented	O
another	O
important	O
milestone	O
as	O
it	O
was	O
the	O
first	O
version	O
where	O
very	O
large	O
contributions	O
(	O
in	O
terms	O
of	O
code	O
size	O
)	O
were	O
made	O
by	O
the	O
Linux-HA	B-Operating_System
community	O
at	O
large	O
.	O
</s>
<s>
After	O
version	O
2.1.4	O
,	O
the	O
cluster	O
resource	O
manager	O
component	O
(	O
responsible	O
for	O
starting	O
and	O
stopping	O
resources	O
and	O
monitoring	O
resource	O
and	O
node	O
failure	O
)	O
was	O
split	O
off	O
into	O
a	O
separate	O
project	O
called	O
Pacemaker	B-Operating_System
,	O
and	O
the	O
resource	O
agents	O
and	O
other	O
"	O
glue	O
"	O
infrastructure	O
were	O
moved	O
to	O
separate	O
packages	O
.	O
</s>
<s>
Thus	O
with	O
the	O
version	O
3	O
series	O
,	O
the	O
name	O
Heartbeat	B-Operating_System
should	O
be	O
used	O
for	O
the	O
cluster	O
messaging	O
layer	O
only	O
.	O
</s>
