<s>
In	O
IBM	B-Device
mainframes	I-Device
,	O
Workload	B-Application
Manager	I-Application
(	O
WLM	O
)	O
is	O
a	O
base	O
component	O
of	O
MVS/ESA	O
mainframe	O
operating	B-General_Concept
system	I-General_Concept
,	O
and	O
its	O
successors	O
up	O
to	O
and	O
including	O
z/OS	B-Application
.	O
</s>
<s>
It	O
controls	O
the	O
access	O
to	O
system	O
resources	O
for	O
the	O
work	O
executing	O
on	O
z/OS	B-Application
based	O
on	O
administrator-defined	O
goals	O
.	O
</s>
<s>
Workload	B-Application
Manager	I-Application
components	O
also	O
exist	O
for	O
other	O
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
For	O
example	O
,	O
an	O
IBM	O
Workload	B-Application
Manager	I-Application
is	O
also	O
a	O
software	O
product	O
for	O
AIX	B-Application
operating	I-Application
system	I-Application
.	O
</s>
<s>
On	O
z/OS	B-Application
the	O
Workload	B-Application
Manager	I-Application
(	O
WLM	O
)	O
component	O
fulfills	O
these	O
needs	O
by	O
controlling	O
work	O
's	O
access	O
to	O
system	O
resources	O
based	O
on	O
external	O
specifications	O
by	O
the	O
system	O
administrator	O
.	O
</s>
<s>
The	O
active	O
service	O
definition	O
is	O
saved	O
on	O
a	O
couple	O
data	O
set	O
which	O
allows	O
all	O
z/OS	B-Application
systems	O
of	O
a	O
Parallel	B-Operating_System
Sysplex	I-Operating_System
cluster	O
to	O
access	O
and	O
execute	O
towards	O
the	O
same	O
performance	O
goals	O
.	O
</s>
<s>
This	O
way	O
of	O
z/OS	B-Application
Workload	B-Application
Manager	I-Application
controlling	O
the	O
access	O
of	O
work	O
to	O
system	O
resources	O
is	O
named	O
goal	O
oriented	O
workload	O
management	O
and	O
is	O
in	O
contrast	O
to	O
resource	O
entitlement	O
based	O
workload	O
management	O
which	O
defines	O
a	O
much	O
more	O
static	O
relationship	O
how	O
work	O
can	O
access	O
the	O
system	O
resources	O
.	O
</s>
<s>
Resource	O
entitlement	O
based	O
workload	O
management	O
is	O
found	O
on	O
larger	O
UNIX	B-Application
operating	I-Application
systems	I-Application
for	O
example	O
.	O
</s>
<s>
A	O
major	O
difference	O
to	O
workload	O
management	O
components	O
on	O
other	O
operating	B-General_Concept
systems	I-General_Concept
is	O
the	O
close	O
cooperation	O
between	O
z/OS	B-Application
Workload	B-Application
Manager	I-Application
and	O
the	O
major	O
applications	O
;	O
middleware	O
and	O
subsystems	O
executing	O
on	O
z/OS	B-Application
.	O
</s>
<s>
In	O
addition	O
WLM	O
offers	O
interfaces	O
which	O
allow	O
load	O
balancing	O
components	O
to	O
place	O
work	O
requests	O
on	O
the	O
best	O
suited	O
system	O
in	O
a	O
parallel	B-Operating_System
sysplex	I-Operating_System
cluster	O
.	O
</s>
<s>
Over	O
time	O
z/OS	B-Application
Workload	B-Application
Manager	I-Application
became	O
the	O
central	O
control	O
component	O
for	O
all	O
performance	O
related	O
aspects	O
in	O
a	O
z/OS	B-Application
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
In	O
a	O
Parallel	B-Operating_System
Sysplex	I-Operating_System
cluster	O
the	O
z/OS	B-Application
Workload	B-Application
Manager	I-Application
components	O
work	O
together	O
to	O
provide	O
a	O
single	O
image	O
view	O
for	O
the	O
executing	O
applications	O
on	O
the	O
cluster	O
.	O
</s>
<s>
On	O
a	O
System	B-Device
z	I-Device
with	O
multiple	O
virtual	O
partitions	B-Device
z/OS	B-Application
WLM	O
allows	O
to	O
interoperate	O
with	O
the	O
LPAR	B-Device
Hypervisor	B-Operating_System
to	O
influence	O
the	O
weighting	O
of	O
the	O
z/OS	B-Application
partitions	B-Device
and	O
to	O
control	O
the	O
amount	O
of	O
CPU	O
capacity	O
which	O
can	O
be	O
consumed	O
by	O
the	O
logical	B-Device
partitions	I-Device
.	O
</s>
