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

Operation Performed: # olrad –C | -d <slot id>
Criticality reported by CRA:
CRA_SYSTEM_CRITICAL
Explanation and user action required:
The olrad(1M) command with –C option reports the resource usage and its criticality.
The above operation with olrad(1M) with –d will remove either the SG heart-beat or the stand-by LAN
connection, leading to loss of highly-available cluster functionality.
Because of the above reason, the requested olrad operations will not be allowed by CRA to proceed
and the operation will fail with CRA_SYSTEM_CRITICAL error.
However, if the user wants to proceed with the olrad delete operation, he can do so at his own risk
by performing the following steps:
• Halt the SG cluster and remove the NIC that is about to be deleted from the SG cluster
configuration file.
• Configure an alternative NIC in SG cluster configuration file.
• Re-start the SG cluster and verify the functionality.
• Proceed with the olrad delete operation to delete the NIC.
Scenario 17
System Configuration:
HP-UX system is running with an IB (InfiniBand) card, with IP-over-IB interface
(ipoib) and configured with an IP address; the ipoib interface is configured as a heart-beat or a stand-
by LAN in Service Guard cluster configuration and the SG configuration, in addition includes one or
more other LAN cards.
User Scenario:
To delete the IB card and add a different card, which can be claimed by the same or
different driver.
Operation Performed:
# olrad –C | -d <slot id>
Criticality reported by CRA:
CRA_SYSTEM_CRITICAL
Explanation and user action required:
The olrad(1M) command with –C option reports the resource usage and its criticality.
The above operation with olrad(1M) with –d option (if it were to be allowed) will remove either the
SG heart-beat or the stand-by LAN connection, thereby resulting in degradation of redundancy in
highly-available cluster configuration.
Because of the above reason, the requested olrad operation will not be allowed by CRA to proceed
and the operation will fail with CRA_SYSTEM_CRITICAL error.
If this olrad –d operation must be performed for system administration purposes, the user may choose
at his own risk, to override the driver criticality by forcibly suspending the IB card using the olrad -r –f
option, followed by olrad –d.
However, the deletion of the IB card will result in stale SG configuration. That is, the SG configuration
will continue to include the ipoib interface, even after the IB card has been deleted from the system.
The stale ipoib interface can be removed from the SG configuration at the next convenient opportunity
when the user is prepared to halt the SG cluster service.
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