<s>
Intelligent	B-Architecture
Peripheral	I-Architecture
Interface	I-Architecture
(	O
IPI	O
)	O
was	O
a	O
server-centric	O
storage	O
interface	B-General_Concept
used	O
in	O
the	O
1980s	O
and	O
early	O
1990s	O
with	O
an	O
ISO-9318	O
standard	O
.	O
</s>
<s>
The	O
idea	O
behind	O
IPI	O
is	O
that	O
the	O
disk	O
drives	O
themselves	O
are	O
as	O
simple	O
as	O
possible	O
,	O
containing	O
only	O
the	O
lowest	O
level	O
control	O
circuitry	O
,	O
while	O
the	O
IPI	O
interface	B-General_Concept
card	O
encapsulates	O
most	O
of	O
the	O
disk	O
control	O
complexity	O
.	O
</s>
<s>
The	O
IPI	O
interface	B-General_Concept
card	O
,	O
as	O
a	O
central	O
point	O
of	O
control	O
,	O
is	O
thus	O
theoretically	O
able	O
to	O
best	O
coordinate	O
accesses	O
to	O
the	O
connected	O
disks	O
,	O
as	O
it	O
"	O
knows	O
"	O
more	O
about	O
the	O
states	O
of	O
the	O
connected	O
disks	O
than	O
would	O
,	O
say	O
,	O
a	O
SCSI	B-Architecture
interface	B-General_Concept
.	O
</s>
<s>
In	O
practice	O
,	O
the	O
theoretical	O
advantages	O
of	O
IPI	O
over	O
SCSI	B-Architecture
were	O
often	O
not	O
realized	O
,	O
as	O
they	O
only	O
materialized	O
when	O
several	O
disks	O
were	O
connected	O
to	O
the	O
interface	B-General_Concept
,	O
which	O
could	O
then	O
easily	O
become	O
a	O
bandwidth	O
bottleneck	O
.	O
</s>
