Host I/O 109
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 “Stopping I/O” (page 128).
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 116).
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 116). Avoid contact with midplane components, module connectors, leads,
pins, and exposed circuitry.
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