Software and configuration utilities 66
properly, the system periodically resets the timer. However, when the operating system fails, the timer
expires and restarts the server.
ASR increases server availability by restarting the server within a specified time after a system hang. You
can disable ASR from the System Management Homepage or through UEFI System Utilities.
USB support
Hewlett Packard Enterprise server blades support both USB 2.0 ports and USB 3.0 ports. Both port types
support installing all types of USB devices (USB 1.0, USB 2.0, and USB 3.0), but might run at lower
speeds in specific situations:
•
USB 3.0 capable devices operate at USB 2.0 speeds when installed in a USB 2.0 port.
•
In UEFI Boot Mode, Hewlett Packard Enterprise provides legacy USB support in the preboot
environment before the operating system loading for USB 1.0, USB 2.0, and USB 3.0 speeds.
•
In Legacy BIOS Boot Mode, Hewlett Packard Enterprise provides legacy USB support in the preboot
environment before the operating system loading for USB 1.0 and USB 2.0 speeds. USB 3.0 ports
can be used with all devices in Legacy BIOS Boot Mode but are not available at USB 3.0 speeds in
the preboot environment. Standard USB support (USB support from within the operating system) is
provided by the OS through the appropriate USB device drivers. Support for USB 3.0 varies by
operating system.
For maximum compatibility of USB 3.0 devices with all operating systems, Hewlett Packard Enterprise
provides a configuration setting for USB 3.0 Mode. Auto is the default setting. This setting impacts USB
3.0 devices when connected to USB 3.0 ports in the following manner:
•
Auto (default)
—If configured in Auto Mode, USB 3.0 capable devices operate at USB 2.0 speeds in
the preboot environment and during boot. When a USB 3.0 capable OS USB driver loads, USB 3.0
devices transition to USB 3.0 speeds. This mode is compatible with operating systems that do not
support USB 3.0 while allowing USB 3.0 devices to operate at USB 3.0 speeds with state-of-the-art
operating systems.
•
Enabled
—If Enabled, USB 3.0 capable devices operate at USB 3.0 speeds at all times (including
the preboot environment) when in UEFI Boot Mode. Do not use this mode with operating systems
that do not support USB 3.0. If operating in Legacy Boot BIOS Mode, the USB 3.0 ports cannot
function in the preboot environment and are not bootable.
•
Disabled
—If configured for Disabled, USB 3.0 capable devices function at USB 2.0 speeds at all
times.
The pre-OS behavior and default operation of the USB ports is configurable in the UEFI System Utilities.
For more information, see the UEFI System Utilities user guide for your product on the Hewlett Packard
Enterprise website (
http://www.hpe.com/info/UEFI/docs
External USB functionality
Hewlett Packard Enterprise provides external USB support to enable local connection of USB devices for
server blade administration, configuration, and diagnostic procedures.
For additional security, external USB functionality can be disabled through USB options in UEFI System
Utilities.
Redundant ROM support
The server blade enables you to upgrade or configure the ROM safely with redundant ROM support. The
server blade has a single ROM that acts as two separate ROM images. In the standard implementation,
one side of the ROM contains the current ROM program version, while the other side of the ROM contains
a backup version.
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