micro partitioning.

we are distributing the processing capability of one or more physical processor among the partitions

using micro partitioning we can increase the overall utilization of processor resources within the system.


suppose we are having   4 processors  i.e. 4 processing units(PU) and we are having four partitions.you have assigned 1PU to all partitions.you  find that on all the partitions about 50% of processor is un-utilized  now .you want to create some more partitions . options are

1.that you have to add more processors to the server  that will add extra cost or burden to ur's firm.or

2.  you can free some processing units from all the lpar's as they are only 50% utilized atmost. this you can do by DLPAR operation through HMC ,if you don't want to reboot.

you can re-assign the processors according to ur's need :here i have reassigned the processing units so, that i can utilize those processor more efficiently and assign the freed PU to the new partitions that i want to create..

lpar1      minimum  .1      desired .3        maximum. .5
lpar 2     minimum .1       desired .2         maximum .3
lpar3      minimum .1       desired .4         maximum .6
lpar4      minimum .1       desired .3         maximum. .6


PROCESSING UNITS(PU) -  the capability of assigning less than 1 processor to a partition is call ed micro-partitioning.
                          for allocating less than 1 processor ,we use processing units(PU)

1 processor corresponds to  1 PU

** we can assign minimun of 1/10 i.e. 0.1 PU to a  partition.
** minimum granuality for assigning extra PU is .01

what is minimum,desired and maximum ?

minimum --  partition will not start if this much PU is not available
desired------  partition will use this much of PU ,if available
maximum ---  partition can be increased to this amount if using Dlpar.

here click to "advanced"

what is capped and uncapped?

capped---processing capability can never exceed the entitled (assigned) processing capability of partition.

uncapped --  the processing capability can exceed the entitled capacity when resources are available in there shared -processor pool and the partition is eligible to run.

* higher the uncapped weight of partition the more processing units it will receive.
* uncapped weight ranges between 0 to 255. default is 128.