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

The olrad(1M) command with –C option reports the resource usage and its criticality.
The olrad(1M) with –r or –d options (if it were to be allowed) will render the swap device unavailable
and this will result in system crash, hang, performance issues, or any other indeterminate state.
Because of the above reasons, the requested olrad operations will not be allowed by CRA to proceed
and the operation will fail with CRA_SYSTEM_CRITICAL error.
If any of these operations must be performed for system administration purposes, the user must ensure
that the swap device is reachable through an alternative healthy card before performing the above
operations.
This recommendation is possible only if the swap device in question is configured using the path
independent device special file (DSF).
If the swap device has been configured using path dependent device special file, it will not be
possible to provide any alternative path to the swap device without loss of swap functionality, which
may lead to system crash, hang or any indeterminate system state.
Scenario 7
System Configuration:
HP-UX kernel dump device is configured on a logical volume (could be either
LVM or VxVM volume) on a physical disk (PV) with a single lunpath through an HBA
Operation Performed:
# olrad –C | -r | -d <slot id>
Or
# scsimgr disable –H <dump device lunpath>
Criticality reported by CRA:
CRA_DATA_CRITICAL
Explanation and user action required:
The olrad(1M) command with –C option reports the resource usage and its criticality.
The above operations with scsimgr and the olrad(1M) with –r or –d options will fail with
CRA_DATA_CRITICAL error. Overriding the error and proceeding with the operation will make the
dump device unavailable for capturing kernel dump, such as in the event of any subsequent system
crash or hang, thereby resulting in inability to debug the system problems.
If any of these operations must be performed for system administration purposes, then, before
performing the operation the user must configure another disk as the dump device or alternative path
(in case of scsimgr operation) or alternative healthy card (in case of olrad operation).
Service Guard Configuration Scenarios
Scenario 8
System Configuration:
HP-UX OS running in Service Guard (SG) cluster environment with common
lock disk between the cluster nodes. The common lock disk has only one lunpath through an HBA.
Operation Performed:
# olrad –C | -r | -d <slot id>
Or
# scsimgr disable –H <lunpath to quorum disk>
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