HPE ProLiant DL20, Maintenance And Service Manual

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• Supports online array capacity expansion, logical drive extension, assignment of online spares, and RAID
or stripe size migration
• Provides diagnostic and SmartSSD Wear Gauge functionality on the Diagnostics tab
• For supported controllers, provides access to additional features.
For more information about HPE SSA, see the Hewlett Packard Enterprise website .
USB support
Hewlett Packard Enterprise servers 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.
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 .
External USB functionality
Hewlett Packard Enterprise provides external USB support to enable local connection of USB devices for
server administration, configuration, and diagnostic procedures.
For additional security, external USB functionality can be disabled through USB options in UEFI System
Utilities.
Automatic Server Recovery
ASR is a feature that causes the system to restart when a catastrophic operating system error occurs, such
as a blue screen, ABEND, or panic. A system fail-safe timer, the ASR timer, starts when the System
Management driver, also known as the Health Driver, is loaded. When the operating system is functioning
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.
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