<s>
Peer	B-Device
to	I-Device
Peer	I-Device
Remote	I-Device
Copy	I-Device
or	O
PPRC	O
is	O
a	O
protocol	O
to	O
replicate	O
a	O
storage	O
volume	O
to	O
another	O
control	O
unit	O
in	O
a	O
remote	O
site	O
.	O
</s>
<s>
In	O
IBM	O
zSeries	O
computers	O
with	O
two	O
direct	B-Application
access	I-Application
storage	I-Application
device	I-Application
(	O
DASD	B-Application
)	O
control	O
units	O
connected	O
through	O
dedicated	O
connections	O
,	O
PPRC	O
is	O
the	O
protocol	O
used	O
to	O
mirror	O
a	O
DASD	B-Application
volume	O
in	O
one	O
control	O
unit	O
(	O
the	O
primary	O
)	O
to	O
a	O
DASD	B-Application
volume	O
in	O
the	O
other	O
control	O
unit	O
(	O
the	O
secondary	O
)	O
.	O
</s>
<s>
In	O
the	O
IBM	B-Application
SAN	I-Application
Volume	I-Application
Controller	I-Application
PPRC	O
is	O
used	O
to	O
mirror	O
a	O
virtualized	O
storage	O
volume	O
to	O
remote	O
(	O
or	O
the	O
same	O
)	O
cluster	O
.	O
</s>
<s>
PPRC	O
is	O
also	O
referred	O
to	O
as	O
Metro	B-Device
Mirror	I-Device
when	O
comparing	O
to	O
Global	B-Application
Mirror	I-Application
.	O
</s>
