Hitachi Compute Blade 2000, User Manual

Page: 1069 / 1927

1018
12
Log
ical
par
titio
ni
ng man
age
r

Logical partitioning of memory
The memory size to be allocated to each LPAR can be specified for each LPAR (in
multiples of 256 MB). Each guest OS has exclusive use of the memory assigned to its
LPAR.
LPAR manager automatically determines which physical memory offset areas to allocate
to an LPAR when the LPAR is activated.

Memory space for LPAR manager
LPAR manager uses a part of physical memory as follows:
Standard server blade High-performance server blade
LPAR manager
standard mode
LPAR manager
expansion mode
LPAR manager
standard mode
LPAR manager
expansion mode
1280 MB 1536 MB 1536 MB 1536 MB
When LPAR manager operating mode is changed from
standard mode to expansion mode, LPAR manager starts
with memory to which 256 MB is added. For example, the
memory for the guest OS is reduced by 256 MB. This might
cause some LPARs not to activate due to a memory shortage
if the maximum memory has been used in LPAR manager
standard mode.

Memory space for logical firmware
Logical firmware uses a part of memory space assigned to each LPAR.
Memory space used by logical firmware can be estimated using the following
equations.
(a) Less than 8 GB memory assigned to an LPAR
0.6% of memory assigned to the LPAR + Number of logical processors X 2.25
MB + 65 MB
(b) 8 GB or more memory assigned to an LPAR
0.25% of memory assigned to the LPAR + Number of logical processors X 2.25
MB + 80 MB
Memory space for logical firmware
Memory space
for LPAR
manager
Memory space
for a guest OS
Memory space
for a guest OS
Memory space
for a guest OS
LPAR#3 LPAR#2 LPAR#1
-----