<s>
A	O
shared-disk	B-Operating_System
architecture	I-Operating_System
(	O
SD	O
)	O
is	O
a	O
distributed	O
computing	O
architecture	O
in	O
which	O
the	O
nodes	O
share	O
same	O
disk	O
devices	O
but	O
each	O
node	O
has	O
its	O
own	O
private	O
memory	O
.	O
</s>
<s>
It	O
contrasts	O
with	O
shared-nothing	B-Operating_System
architecture	I-Operating_System
,	O
in	O
which	O
all	O
nodes	O
have	O
sole	O
access	O
to	O
distinct	O
disks	O
.	O
</s>
