Logical Partitioning Of Processors - Hitachi Compute Blade 500 Series User Manual

Logical Partitioning of Processors

The method of logically dividing the physical processor is referred to as the
scheduling mode. You can select dedicated mode or shared mode for the
scheduling mode. Different features of each mode are shown in the table
below.
Mode
Dedicated
Mode
Shared
Mode
Dedicated Mode
Example of Dedicated Mode is below
1-4
Hitachi Compute Blade 500 Series Logical partitioning manager User's Guide
Table 1-3 Processor Scheduling Mode
Description
The logical processor on an LPAR dedicatedly uses
the corresponding physical processor.Since there is
no overhead for switching the physical processors
between the logical processors, the LPAR performs
faster. For each LPAR, it is possible to specify the
number of dedicated logical processors assigned.
(However, it is not possible to specify more than
the number of physical processors available.).
Physical processors are time-shared among the
logical processors defined in the LPAR for which the
shared mode is specified. The utilization rate of the
physical processors can be set dynamically for each
LPAR, allowing flexible use of physical processor
resources. The number of logical processors to be
used in the shared mode can be set for each LPAR.
(It is possible to specify more than the number of
physical processors available, but this operations
may cause the extremely slow down.).
Figure 1-3 Processor Assignment of Dedicated Mode
LPAR manager Functions
Recommended
System
System required high
processing
performanceSystem
required critical time
period and high
processing in
performance
System required cost
efficiency and
flexibility rather than
high processing
performanceSystem
required balanced
processing between
LPARs