Interface Card Critical Resource Analysis(CRA) Whitepaper for HP-UX 11i v3

User Scenario: Unload the interface driver of the LAN card, whose lan ppa is part of the APA
configuration.
Operation Performed:
# kcmodule <interface driver associated with card >=unused
Criticality reported by CRA:
CRA_WARNING
Explanation and user action required:
The above operation with kcmodule(1M) will unload the NIC driver of LAN ports configured in the
APA group, which will result in deletion of these LAN ports from the APA group. This will result in the
reduction of the available network I/O bandwidth of the APA group and may also possibly impact
LAN failover capability.
Because of the above reasons, the CRA will allow the requested kcmodule operation with a
WARNING.
If this operation must be performed for system administration purposes without degrading the link
aggregate bandwidth or without compromising the LAN failover capability, then before proceeding
with the intended kcmodule driver unload operation, configure additional LAN ports in the affected
APA group from an alternative NIC that is controlled by a different NIC driver other than the one
about to be unloaded.
Scenario 11
System Configuration:
HP-UX system is running with IP address assigned to an APA (Auto-port
Aggregation) group and the link aggregate contains LAN ports from a single multi-port NIC.
User Scenario:
Unload the interface driver of the LAN card, whose lan ppa is part of APA group.
Operation Performed:
# kcmodule <interface driver associated with card>=unused
Criticality reported by CRA:
CRA_DATA_CRITICAL
Explanation and user action required:
The above operation with kcmodule(1M) will unload the NIC driver of LAN ports configured in the
APA group, which will result in deletion of all LAN ports from the APA group.
This may result in network applications running on the system hanging, inaccessible to the network
client applications, leading to application downtime or any other indeterminate system state.
Because of the above reasons, the requested driver unload operation will not be allowed by CRA to
proceed and the operation will fail with CRA_DATA_CRITICAL error.
If this operation must be performed for system administration purposes, then before proceeding with
the intended kcmodule driver unload operation, configure additional LAN ports in the affected APA
group from an alternative NIC that is controlled by a different NIC driver than the one about to be
unloaded.
Scenario 12
System Configuration:
HP-UX system is running with IP address assigned to an APA (Auto-port
Aggregation) group and the link aggregate contains LAN ports from two or more NICs.
User Scenario:
Deletion of APA interface.
Operation Performed:
#nwmgr --delete –A links=all –c lan<apa_ppa>
Criticality reported by CRA:
CRA_DATA_CRITICAL
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