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

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 operations with scsimgr and olrad(1M) with –r or –d options (if it were to be allowed) will

render the quorum disk unavailable if the requested operation is allowed to proceed. This process will

result in the node being evicted from the cluster. Because the proper functioning of the SG cluster is

considered one of the critical configurations, the above requested 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

configure another lunpath to the SG quorum disk, which is reachable through an alternative healthy

card before performing the above operations. However, this recommendation is possible only if the

SG quorum disk has been configured using path-independent device special file (DSF).

If the quorum disk has been configured using path dependent device special file, it will not be

possible to provide any alternative path to the quorum disk without losing the SG cluster functionality

and hence the requested olrad operation is not recommended.

However, if the user is prepared to stop the SG cluster service, a different quorum disk can be

configured using an alternative healthy card (in case of the olrad operation) or an alternative path

can be configured using the same or a different card (in case of the scsimgr operation) and the

required operation can be performed.

Scenario 9

System Configuration:

HP-UX OS running in Service Guard (SG) cluster environment with common

lock disk between the cluster nodes, and the common lock disk has multiple lunpaths which originate

from different ports of the same card (for example, AB379B dual ported 4GB FC card).

Operation Performed:

# olrad –C | -r | -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.

Though there are more than one lunpaths to the quorum disk, the olrad(1M) with –r or –d options (if it

were to be allowed) will render the quorum disk unavailable if the requested operation is allowed to

proceed because all lunpaths are from a single card with multiple ports.

Because this will result in the node being evicted from the cluster and the proper functioning of the SG

cluster is considered as one of the critical configurations, the above requested olrad operations will

not be allowed by CRA to proceed and the operation will fail with a CRA_SYSTEM_CRITICAL

error.

If any of these operations must be performed for system administration purposes, the user must ensure

that the SG quorum disk is reachable through an alternative healthy card before performing the

above operations. However, this recommendation is possible only if the quorum disk has been

configured using path-independent device special file (DSF).

If the quorum disk has been configured using path dependent device special file, it will not be

possible to provide an alternative path to the quorum disk without losing the SG cluster functionality

and hence the requested olrad operation is not recommended. However, if the user is prepared to