The SCSI card Power-On Self Tests (POSTs) start each time
power is switched on, or when a Reset command is sent from the using
system SCSI attachment. They check only the internal components of
the SCSI card; they do not check any interfaces to other FRUs.
If the POSTs complete successfully, control passes to the functional
microcode of the SCSI card. This microcode checks all the internal
interfaces of the I/O enclosure, and reports failures to the host
system.
If the POSTs fail, one of the following events occur:
- The SCSI card check LED and the enclosure check LED come on.
- If the SCSI was configured for high availability using a dual
initiator card the error will be reported. However, the functional
operation of the enclosure is not affected. For example, the customer
still has access to all the disk drive modules.
The failure is reported when:
- the failure occurs at system bring-up time, the host system might
detect that the enclosure is missing, and reports an error.
- the failure occurs at any time other than system bring-up time,
the hourly health check reports the failure.
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