<s>
A	O
diskless	B-Operating_System
shared-root	I-Operating_System
cluster	I-Operating_System
is	O
a	O
way	O
to	O
manage	O
several	O
machines	O
at	O
the	O
same	O
time	O
.	O
</s>
<s>
Instead	O
of	O
each	O
having	O
its	O
own	O
operating	B-General_Concept
system	I-General_Concept
(	O
OS	O
)	O
on	O
its	O
local	O
disk	O
,	O
there	O
is	O
only	O
one	O
image	O
of	O
the	O
OS	O
available	O
on	O
a	O
server	O
,	O
and	O
all	O
the	O
nodes	O
use	O
the	O
same	O
image	O
.	O
</s>
<s>
To	O
ensure	O
that	O
there	O
is	O
no	B-Architecture
single	I-Architecture
point	I-Architecture
of	I-Architecture
failure	I-Architecture
,	O
the	O
NFS	O
export	O
for	O
the	O
boot-image	O
should	O
be	O
hosted	O
on	O
a	O
two	O
node	O
cluster	O
.	O
</s>
<s>
The	O
architecture	O
of	O
a	O
diskless	B-Device
computer	I-Device
cluster	O
makes	O
it	O
possible	O
to	O
separate	O
servers	O
and	O
storage	O
array	O
.	O
</s>
<s>
The	O
operating	B-General_Concept
system	I-General_Concept
as	O
well	O
as	O
the	O
actual	O
reference	O
data	O
(	O
userfiles	O
,	O
databases	O
or	O
websites	O
)	O
are	O
stored	O
competitively	O
on	O
the	O
attached	O
storage	O
system	O
in	O
a	O
centralized	O
manner	O
.	O
</s>
<s>
A	O
similar	O
technology	O
can	O
be	O
found	O
in	O
VMScluster	B-Operating_System
(	O
OpenVMS	B-Operating_System
)	O
and	O
TruCluster	B-General_Concept
(	O
Tru64	B-Operating_System
UNIX	I-Operating_System
)	O
.	O
</s>
<s>
The	O
open-source	O
implementation	O
of	O
a	O
diskless	B-Operating_System
shared-root	I-Operating_System
cluster	I-Operating_System
is	O
known	O
as	O
Open-Sharedroot	O
.	O
</s>
