To move from the EFI to MP, press Ctrl/B (this assumes MP is present and configured).
For more information about using EFI, see the documentation provided for your Integrity servers.
B.4 Enabling or Disabling Hyper-Threading on Dual-Core Processors
Systems that have Intel Itanium Dual-Core processors can support Hyper-Threading.
Hyper-Threading provides the ability for processors to create an additional logical CPU that
might allow additional efficiencies of processing. For example, a dual-core processor with
Hyper-Threading active provides four logical CPUs, two on each core. The effect that
Hyper-Threading has on performance depends heavily on the applications running on your
system. HP recommends that you start with Hyper-Threading disabled and experiment later, if
you wish.
You can enable or disable Hyper-Threading for a system whose processors support it. To display
the Hyper-Threading state for a system, use the EFI info cpu or cpuconfig command. (The
display indicates that “CPU threads” are turned on or off.) For example:
Shell> cpuconfig
PROCESSOR MODULE INFORMATION
# of L3 L4 Family/
CPU Logical Cache Cache Model Processor
Module CPUs Speed Size Size (hex.) Rev State
----- ------- ------ ------ ------ --------- --- -----
0 4 1.4 GHz 6 MB None 20/00 CO Active
CPU threads are turned on.
To enable or disable Hyper-Threading, use the EFI cpuconfig threads on or cpuconfig
threads off command. For more information, enter help cpuconfig at the EFI Shell prompt
or see the appropriate hardware documentation. The recent release of the Partition Manager also
supports Hyper-Threading.
After enabling or disabling Hyper-Threading, the system must be reset for the change to take
effect. Use the EFI Shell reset command. When Hyper-Threading is enabled, it remains active
on the next reboot of the system.
B.5 Configuring and Managing OpenVMS Booting on Integrity servers
This section explains how to configure and manage the booting behavior of your Integrity servers.
You can use the EFI Boot Manager (while the operating system is not running) or the OpenVMS
Integrity servers Boot Manager (while the operating system is running) to configure boot options.
HP recommends using the latter.
You can configure multiple boot entries for a single operating system. On cell-based Integrity
servers running multiple operating systems, you can configure boot options for all currently
installed operating systems. On cell-based servers, each nPartition has a local instance of EFI
that is specific to that partition. Each partition can be booted and stopped independently of other
nPartitions in the system, and each partition executes its own operating system image.
On cell-based servers, to successfully boot an operating system you must first ensure that the
ACPI configuration is correct for the operating system being booted, as explained in Section B.5.1
(page 204). Each nPartition has its own ACPI configuration value.
IMPORTANT: To configure booting on a Fibre Channel storage device, you must use the
OpenVMS Integrity servers Boot Manager utility. (For information about configuring Fibre
Channel devices, see Appendix E (page 289).) HP also recommends using this utility to add
members of a multiple-member shadow set to the boot device list and dump device list. Be sure
to add all members to both lists.
If you have just completed the initial setup of your Integrity servers, perform the following steps
before continuing:
B.4 Enabling or Disabling Hyper-Threading on Dual-Core Processors 203
