<s>
HP	B-Application
Serviceguard	I-Application
,	O
formerly	O
known	O
as	O
MC/ServiceGuard	B-Application
,	O
is	O
a	O
high-availability	B-General_Concept
cluster	I-General_Concept
software	O
produced	O
by	O
HP	O
that	O
runs	O
on	O
HP-UX	B-Application
and	O
Linux	B-Application
.	O
</s>
<s>
Serviceguard	B-Application
has	O
existed	O
since	O
1990	O
,	O
which	O
HP	O
claims	O
to	O
have	O
been	O
the	O
first	O
high	O
availability	O
solution	O
for	O
UNIX	B-Application
.	O
</s>
<s>
A	O
Linux	B-Application
port	O
called	O
SG/LX	O
has	O
existed	O
since	O
1999	O
,	O
but	O
was	O
briefly	O
suspended	O
and	O
then	O
reintroduced	O
in	O
June	O
2012	O
.	O
</s>
