If The Enclosure Does Not Initialize; Correcting Enclosure Ids; Host I/O; Dealing With Hardware Faults - Lenovo ThinkSystem DS Series Hardware Installation And Maintenance Manual

If the enclosure does not initialize

It may take up to two minutes for all enclosures to initialize. If an enclosure does not initialize:
• Perform a rescan
•
Power cycle the system
• Make sure the power cord is properly connected, and check the power source to which it is connected
• 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 enclosures in a different
configuration, 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 SMC 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 perform a rescan using the SMC:
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.

Host I/O

When troubleshooting disk drive and connectivity faults, stop I/O to the affected disk groups from all hosts as a
data protection precaution. As an additional data protection precaution, it is helpful to conduct regularly scheduled
backups of your data. See also

Dealing with hardware faults

Ensure that you have obtained a replacement module of the same type before removing any faulty module as
described in "Module removal and replacement" (page
IMPORTANT: If the enclosure system is powered up and you remove any module, replace it immediately. If the
system is used with any modules missing for more than a few seconds, the enclosure(s) can overheat, causing
power failure and potential data loss. Such action can invalidate the product warranty.
IMPORTANT: Observe applicable/conventional ESD precautions when handling modules and components, as
described in "ESD precautions" (page
pins, and exposed circuitry.
"Stopping I/O" (page 128).
116).
116). Avoid contact with midplane components, module connectors, leads,
Host I/O 109