<s>
STONITH	B-Operating_System
(	O
"	O
Shoot	O
The	O
Other	O
Node	B-Protocol
In	O
The	O
Head	O
"	O
or	O
"	O
Shoot	O
The	O
Offending	O
Node	B-Protocol
In	O
The	O
Head	O
"	O
)	O
,	O
sometimes	O
called	O
STOMITH	O
(	O
"	O
Shoot	O
The	O
Other	O
Member/Machine	O
In	O
The	O
Head	O
"	O
)	O
,	O
is	O
a	O
technique	O
for	O
fencing	B-Operating_System
in	O
computer	B-Architecture
clusters	I-Architecture
.	O
</s>
<s>
Fencing	B-Operating_System
is	O
the	O
isolation	O
of	O
a	O
failed	O
node	B-Protocol
so	O
that	O
it	O
does	O
not	O
cause	O
disruption	O
to	O
a	O
computer	B-Architecture
cluster	I-Architecture
.	O
</s>
<s>
As	O
its	O
name	O
suggests	O
,	O
STONITH	B-Operating_System
fences	O
failed	O
nodes	O
by	O
resetting	O
or	O
powering	O
down	O
the	O
failed	O
node	B-Protocol
.	O
</s>
<s>
Multi-node	O
error-prone	O
contention	O
in	O
a	O
cluster	O
can	O
have	O
catastrophic	O
results	O
,	O
such	O
as	O
if	O
both	O
nodes	O
try	O
writing	O
to	O
a	O
shared	O
storage	O
resource	O
.	O
</s>
<s>
STONITH	B-Operating_System
provides	O
effective	O
,	O
if	O
rather	O
drastic	O
,	O
protection	O
against	O
these	O
problems	O
.	O
</s>
<s>
Single	O
node	B-Protocol
systems	O
use	O
a	O
comparable	O
mechanism	O
called	O
a	O
watchdog	B-Application
timer	I-Application
.	O
</s>
<s>
A	O
watchdog	B-Application
timer	I-Application
will	O
reset	O
the	O
node	B-Protocol
if	O
the	O
node	B-Protocol
does	O
not	O
tell	O
the	O
watchdog	B-Application
circuit	O
that	O
it	O
is	O
operating	O
well	O
.	O
</s>
<s>
A	O
STONITH	B-Operating_System
decision	O
can	O
be	O
based	O
on	O
various	O
decisions	O
which	O
can	O
be	O
customer	O
specific	O
plugins	O
.	O
</s>
