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

SAN Storage Configuration Scenario

Scenario 28

System Configuration:

A set of LUNs is configured on the storage device to be visible to a particular

fiber channel world wide name (WWN), which belongs to a fiber channel HBA on a system in the

SAN.

Possible usages of these LUNs could be:

• A file system is mounted on one of the LUNs.

• An I/O is in progress to one of the LUNs.

• This LUN is being used as a dump device.

Operation Performed:

# olrad -r | -d <slot id>

Criticality reported by CRA:

CRA_DATA_CRITICAL.

Explanation and user action required:

The above operations with olrad(1M) with –r or –d options (if it were to be allowed) will render the

lunpaths unavailable to reach the LUNs on the device through this HBA. This will result in data loss.

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

are reachable through an alternative card. This will involve reconfiguration on the device to enable

the same LUNs to be visible to the WWN of the alternative card.

LAN CRA Scenarios

IP Address Configured NIC Scenarios

Scenario 1

System Configuration:

HP-UX System is running, which has a Network interface card (NIC),

configured with an IP address and connected to network.

User Scenario:

Replace the NIC with another card of same model.

Delete and add a different type of card which can be claimed by the same or different driver.

Operation Performed: # olrad –C | -r | -d <slot id>

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

will render the

system inaccessible to network.

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 olrad operations will not be allowed by CRA to proceed

and the operation will fail with CRA_DATA_CRITICAL error.