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Important notes and recommendations 11
• Back up the Virtual Connect domain configuration each time changes are made. While saved in
non-volatile memory and check-pointed to the neighboring module, HP recommends saving the
configuration external to the enclosure.
• Removing a VC-Enet module and plugging it into another enclosure causes the configuration
information on that module to be cleared. This action prevents a configured spare from overwriting
configuration data in another enclosure.
• HP 1/10Gb VC-Enet modules support 10GBASE-CX4 stacking cables 0.5 m to 7 m (1.64 ft to
23.00 ft). The 1000BASE-T links can also be used as stacking links of up to 100 m (328 ft). When
multiple cables of either the same or dissimilar type (for example 1Gb and 10Gb) are connected to
the same two modules, they are aggregated to provide enhanced throughput for the stacking link.
The CX4 interface uses the same physical connector as Infiniband, but Infiniband cables are tuned
differently and will not perform as well in CX4 applications. HP recommends purchasing CX4 cable
assemblies that meet the IEEE CX4 specifications and support 10-Gigabit communication at
distances from 3 m to 15 m (9.84 ft to 49.20 ft).
• The Onboard Administrator must have an IP address on the same subnet as the Virtual Connect
module before the administrator sets the Enclosure Bay IP Addressing (EBIPA) mode. Changing the
EBIPA address for a module causes the module to be reset by the OA (resulting in an outage) when
the change is applied. If multiple modules have their EBIPA address changed, all modules
experience the outage at approximately the same time.
• The port monitoring network analyzer port should only be connected directly to an analyzer.
Improper connection of the port or improper configuration of the port monitoring could result in
network loops and cause a network outage.
• Port monitoring is disabled in a mixed firmware environment. If any module in the domain is running
a version of firmware prior to v1.20, port monitoring is automatically disabled.
• When the management network is fully saturated, access to the VC Manager and response times
might be slower due to network congestion.
For additional information, see the Virtual Connect user guide on the HP website
(http://www.hp.com/go/bladesystem/documentation
).