Logical Partitioning Of Pci Devices - Hitachi Compute Blade 500 Series User Manual

Logical Partitioning of PCI Devices

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.
Scheduling
Mode
Dedicated
Mode
Shared Mode
Exclusive
shared mode
Dedicated Mode
Example of Dedicated Mode is below.
Hitachi Compute Blade 500 Series Logical partitioning manager User's Guide
Table 1-5 Assignment Mode of PCI Device
Features
A single PCI device is assigned to a 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.
A single PCI device is assigned to 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.
A single PCI device is assigned to a single LPAR
(guest OS). PCI device assignment can be
changed without stopping operation of LPAR. A
single LPAR can be used, multiple LPARs cannot
be used at the same time.
LPAR manager Functions
Recommended
System
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
USB/KVM, and remote
console
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