HP ProLiant 1200 Eliminating Single Points of Failure and Enabling Rapid Recov - Page 6

Eliminating Single Points of Failure cont.

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ECG0094/1197 Eliminating Single Points of Failure (cont.) ... All Compaq network device drivers have integrated error recovery features that allow the drivers to detect failure events and recover from these errors. The drivers can reset the NIC and continue running, usually without noticeable interruption, after the following types of errors: • Adapter check interrupt: When the hardware detects a problem, a detailed console error message is generated and an immediate attempt to recover begins. • Link status change: Link status changes occur when a cable is unplugged or there is a hub problem. If a fatal link status change occurs, the driver attempts to recover from it. • Transmit integrity check failure: If the driver receives indication that the interface integrity is compromised (by a cable or hub failure, for example), it reports the failure and attempts to recover. Compaq servers can be configured to take advantage of the latest redundant NIC technology, a reliability feature unique to Compaq in this class of servers. Under Windows NT 4.0, Novell IntranetWare, and SCO UNIX, NICs can be installed in redundant controller pairs, sharing a driver (Figure 3). Figure 3: NICs in a redundant controller pair, sharing one device driver. When the device driver detects an error on the NIC and cannot effect recovery, the driver switches the roles of the active and standby interfaces (standby becomes active) without interruption of service, allowing conveniently scheduled replacement of the failed controller. In systems with hot plug capability, the failed NIC can be replaced without shutting down the system. To help ensure a consistently regulated power supply to the I/O boards, Compaq provides two voltage regulator modules per I/O board. The modules monitor one another. If one module fails, the other takes over, and the system administrator is notified through Compaq Insight Manager.

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Eliminating Single Points of Failure (cont.)
ECG0094/1197
All Compaq network device drivers have integrated error recovery features that allow the drivers to
detect failure events and recover from these errors. The drivers can reset the NIC and continue
running, usually without noticeable interruption, after the following types of errors:
•
Adapter check interrupt: When the hardware detects a problem, a detailed console error
message is generated and an immediate attempt to recover begins.
•
Link status change: Link status changes occur when a cable is unplugged or there is a hub
problem. If a fatal link status change occurs, the driver attempts to recover from it.
•
Transmit integrity check failure: If the driver receives indication that the interface integrity
is compromised (by a cable or hub failure, for example), it reports the failure and attempts
to recover.
Compaq servers can be configured to take advantage of the latest redundant NIC technology, a
reliability feature unique to Compaq in this class of servers. Under Windows NT 4.0, Novell
IntranetWare, and SCO UNIX, NICs can be installed in redundant controller pairs, sharing a driver
(Figure 3).
Figure 3: NICs in a redundant controller pair, sharing one device driver.
When the device driver detects an error on the NIC and cannot effect recovery, the driver switches
the roles of the active and standby interfaces (standby becomes active) without interruption of
service, allowing conveniently scheduled replacement of the failed controller. In systems with hot
plug capability, the failed NIC can be replaced without shutting down the system.
To help ensure a consistently regulated power supply to the I/O boards, Compaq provides two
voltage regulator modules per I/O board. The modules monitor one another. If one module fails, the
other takes over, and the system administrator is notified through Compaq Insight Manager.
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