<s>
Dynamic	B-Device
Logical	I-Device
Partitioning	I-Device
(	O
DLPAR	B-Device
)	O
,	O
is	O
the	O
capability	O
of	O
a	O
logical	B-Device
partition	I-Device
(	O
LPAR	B-Device
)	O
to	O
be	O
reconfigured	O
dynamically	O
,	O
without	O
having	O
to	O
shut	O
down	O
the	O
operating	B-General_Concept
system	I-General_Concept
that	O
runs	O
in	O
the	O
LPAR	B-Device
.	O
</s>
<s>
DLPAR	B-Device
enables	O
memory	O
,	O
CPU	O
capacity	O
,	O
and	O
I/O	O
interfaces	O
to	O
be	O
moved	O
nondisruptively	O
between	O
LPARs	B-Device
within	O
the	O
same	O
server	O
.	O
</s>
<s>
DLPAR	B-Device
has	O
been	O
supported	O
by	O
the	O
operating	B-General_Concept
systems	I-General_Concept
AIX	B-Application
and	O
IBM	B-Application
i	I-Application
on	O
almost	O
all	O
POWER4	O
and	O
follow-on	O
POWER	O
systems	O
since	O
then	O
.	O
</s>
<s>
The	O
Linux	B-Operating_System
kernel	I-Operating_System
for	O
POWER	O
also	O
supported	O
DLPAR	B-Device
,	O
but	O
its	O
dynamic	O
reconfiguration	O
capabilities	O
were	O
limited	O
to	O
CPU	O
capacity	O
and	O
PCI	B-Protocol
devices	O
,	O
but	O
not	O
memory	O
.	O
</s>
<s>
In	O
October	O
2009	O
,	O
seven	O
years	O
after	O
the	O
AIX	B-Application
announcement	O
of	O
DLPAR	B-Device
of	O
memory	O
,	O
CPU	O
and	O
IO	O
slots	O
,	O
Linux	B-Operating_System
finally	O
added	O
the	O
capability	O
to	O
DLPAR	B-Device
memory	O
on	O
POWER	O
systems	O
.	O
</s>
<s>
The	O
fundamentals	O
of	O
DLPAR	B-Device
are	O
described	O
in	O
the	O
IBM	O
Systems	O
Journal	O
paper	O
titled	O
:	O
"	O
Dynamic	O
reconfiguration	O
:	O
Basic	O
building	O
blocks	O
for	O
autonomic	O
computing	O
on	O
IBM	O
pSeries	O
Servers	O
.	O
</s>
<s>
Later	O
on	O
,	O
the	O
POWER5	B-Device
processor	O
added	O
enhanced	O
DLPAR	B-Device
capabilities	O
,	O
including	O
micro-partitioning	B-Device
:	O
up	O
to	O
10	O
LPARs	B-Device
can	O
be	O
configured	O
per	O
processor	O
,	O
with	O
a	O
single	O
multiprocessor	O
server	O
supporting	O
a	O
maximum	O
of	O
254	O
LPARs	B-Device
(	O
and	O
thus	O
up	O
to	O
254	O
independent	O
operating	B-General_Concept
system	I-General_Concept
instances	O
)	O
.	O
</s>
<s>
There	O
are	O
many	O
interesting	O
applications	O
of	O
DLPAR	B-Device
capabilities	O
.	O
</s>
<s>
For	O
example	O
,	O
memory	O
,	O
processor	O
or	O
I/O	O
slots	O
can	O
be	O
added	O
,	O
removed	O
or	O
moved	O
to	O
another	O
LPAR	B-Device
,	O
without	O
rebooting	O
the	O
operating	B-General_Concept
system	I-General_Concept
or	O
the	O
application	O
running	O
in	O
an	O
LPAR	B-Device
.	O
</s>
<s>
IBM	O
DB2	O
is	O
such	O
application	O
(	O
)	O
,	O
it	O
is	O
aware	O
of	O
the	O
DLPAR	B-Device
events	O
and	O
automatically	O
tunes	O
itself	O
to	O
changing	O
LPAR	B-Device
resources	O
.	O
</s>
<s>
The	O
IBM	B-Device
Z	I-Device
mainframes	O
and	O
their	O
operating	B-General_Concept
systems	I-General_Concept
,	O
including	O
Linux	B-Application
on	I-Application
IBM	I-Application
Z	I-Application
,	O
support	O
even	O
more	O
sophisticated	O
forms	O
of	O
dynamic	O
LPARs	B-Device
.	O
</s>
<s>
Relevant	O
LPAR-related	O
features	O
on	O
those	O
mainframe	O
platforms	O
include	O
Intelligent	B-Application
Resource	I-Application
Director	I-Application
,	O
Sysplex	O
,	O
Parallel	B-Operating_System
Sysplex	I-Operating_System
,	O
Geographically	O
Dispersed	O
Parallel	B-Operating_System
Sysplex	I-Operating_System
,	O
and	O
HiperSockets	B-Device
.	O
</s>
<s>
The	O
System	O
z9	O
supports	O
up	O
to	O
60	O
LPARs	B-Device
on	O
a	O
single	O
server	O
,	O
but	O
mainframes	O
also	O
support	O
an	O
additional	O
level	O
of	O
virtualization	O
using	O
z/VM	B-Application
with	O
the	O
ability	O
to	O
support	O
thousands	O
of	O
operating	B-General_Concept
system	I-General_Concept
instances	O
on	O
a	O
single	O
server	O
.	O
</s>
