SCSI card power-on self-tests

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.