Guest Numa - Hitachi CB 520H A1 User Manual

allocated memory size may not be available depending on the
specification and environment of guest OS.
Note:
• When the amount of memory for a guest OS is not enough against the
amount applications use, memory swap may happen to cause
performance degradation. When assigning an amount of memory, make
sure to take the memory amount.

Guest NUMA

Overview
NUMA (Non-Uniform Memory Access) is an architecture where memory is
shared in a multiprocessor computer system. To create an LPAR that meets
all of the conditions listed below, we recommend that you use a NUMA
configuration so you can easily improve memory access and memory
bandwidth. The NUMA running on an LPAR is called a guest NUMA.
• You are creating an LPAR on a server blade in an SMP configuration.
• You are creating an LPAR with the processor scheduling mode set to
dedicated mode.
LPAR manager supports the following two methods for configuring logical
processors for the guest NUMA: physical processor binding (for 02-0X or
later) and physical NUMA node binding (for 02-40 or later). Physical
processor binding is the method for associating logical processors with
physical processors. Physical NUMA node binding is the method for
associating logical processors with physical NUMA nodes. The table below
explains specific differences between these binding methods with regard to
how to configure an LPAR.
How to set the
number of logical
processors
How to select a
physical processor to
be assigned to a
logical processor
Setting up a guest NUMA
The following describes how to set up a guest NUMA:
If the physical processor binding is used, follow the procedure below.
1 Configure the NUMA for the EFI.
.
Hitachi Compute Blade 500 Series Logical partitioning manager User's Guide
Physical processor
Item
Sets the number of logical
processors in the entire
LPAR.
Before the LPAR is
activated, the user specifies
the number of the physical
processor that the user will
manually assign.
LPAR manager Functions
Physical NUMA node binding
binding
Sets the number of logical
processors for each node
When the LPAR is activated, LPAR
manager selects, in the ascending
order of numbers, physical
processors that exist in the
automatically specified node and
can be assigned.
1-15