Isolate The Fault; If The Enclosure Does Not Initialize; Correcting Enclosure Ids; Stopping I/O - HP MSA 2040 User Manual

• Informational. A configuration or state change occurred, or a problem occurred that the system
corrected. No immediate action is required.
See the HP MSA Event Descriptions Reference Guide for information about specific events, located at your
HP MSA 2040 manuals page: http://www.hp.com/support/msa2040/manuals.
The event logs record all system events. It is very important to review the logs, not only to identify the fault,
but also to search for events that might have caused the fault to occur. For example, a host could lose
connectivity to a disk group if a user changes channel settings without taking the storage resources
assigned to it into consideration. In addition, the type of fault can help you isolate the problem to either
hardware or software.

Isolate the fault

Occasionally it might become necessary to isolate a fault. This is particularly true with data paths, due to
the number of components comprising the data path. For example, if a host-side data error occurs, it could
be caused by any of the components in the data path: controller module, cable, connectors, or data host.

If the enclosure does not initialize

It may take up to two minutes for the enclosures to initialize. If the enclosure does not initialize:
• Perform a rescan.
• Power cycle the system.
• Make sure the power cord is properly connected, and check the power source that it is connected to.
• Check the event log for errors.

Correcting enclosure IDs

When installing a system with drive enclosures attached, the enclosure IDs might not agree with the
physical cabling order. This is because the controller might have been previously attached to some of the
same enclosures during factory testing, and it attempts to preserve the previous enclosure IDs if possible. To
correct this condition, make sure that both controllers are up, and perform a rescan using the SMU or the
CLI. This will reorder the enclosures, but can take up to two minutes for the enclosure IDs to be corrected.
To perform a rescan using the CLI, type the following command:
rescan
To rescan using the SMU v3:
1. Verify that both controllers are operating normally.
2. Do one of the following:
• Point to the System tab and select Rescan Disk Channels.
• In the System topic, select Action > Rescan Disk Channels.
3. Click Rescan.
To rescan using the SMU v2:
1. Verify that both controllers are operating normally.
2. In the Configuration View panel, right-click the system and select Tools > Rescan Disk Channels.
3. Click Rescan.

Stopping I/O

When troubleshooting disk drive and connectivity faults, stop I/O to the affected disk groups from all hosts
and remote systems as a data protection precaution. As an additional data protection precaution, it is
helpful to conduct regularly scheduled backups of your data.
IMPORTANT:
document.
Stopping I/O to a disk group is a host-side task, and falls outside the scope of this
Stopping I/O 55