Hitachi Compute Blade 2000 User Manual page 1080

(b) When the LPAR configuration in dedicated mode is large and steps over more than
one node.
LPAR
3way
Dedicated
Physical processor
Socket
Core
Physical memory
A large of the large LPAR running in dedicated mode
When LPAR configuration is large, as shown in the figure above, use the shared mode
and do not use dedicated mode.
 Logical partitioning of PCI devices
In LP mode, PCI devices are assigned to each LPAR in either dedicated or shared mode.
The following table shows features of each mode.
Mode
Dedicated ・ A single PCI device is assigned to a
mode single LPAR (guest OS). The guest OS
uses the assigned PCI device
exclusively, so that its I/O performance
is stable.
・ When 2 ports are implemented in a PCI
device, each port cannot be assigned to
a separate LPAR.
Shared ・ A single PCI device is assigned to
mode multiple LPARs (guest OSs). Each guest
OS can use the assigned PCI device at
the same time without knowing that the
PCI device is shared with other OSs.
・ NIC performance of an LPAR is affected
by I/O load of other LPARs.
Logical processor
Dedicated Dedicated
small large
Node0 Node1
Feature
・ System required high processing
performance
・ System required critical time
period and high processing in
performance
・ System required cost efficiency
and flexibility rather than high
processing performance
・ System required balanced
processing between LPARs
1029
Memory access
Memory
access cost
When allocating the memory or
processors, that step over more
than one node, the memory
access performance is unstable.
Recommended system