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SCSI element codes

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SCSI Enclosure Services (SES) devices contains a number of elements, each of which is defined by a one byte SCSI element code. There are many different element codes defined to cover various devices as shown in the list below.

List of SES element codes

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  • 00h - unspecified
  • 01h - device - disk-drive or other SCSI device
  • 02h - power-supply
  • 03h - cooling
  • 04h - temperature-sensor
  • 05h - door lock
  • 06h - audible alarm
  • 07h - enclosure services controller electronics
  • 08h - SCC controller electronics
  • 09h - nonvolatile cache
  • 0Ah - invalid operation reason - used to determine why an ESI device has failed to complete a command
  • 0Bh - UPS
  • 0Ch - display
  • 0Dh - keypad
  • 0Eh - enclosure
  • 0Fh - SCSI port/transceiver
  • 10h - language
  • 11h - communication port
  • 12h - voltage sensor
  • 13h - current sensor
  • 14h - SCSI target port
  • 15h - SCSI initiator port
  • 16h - simple subenclosure
  • 17h - array device
  • 18h - SAS expander
  • 19h - SAS connector
  • 1Ah-7Fh - reserved
  • 80h-FFh - vendor-specific

How SES elements are used

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The SCSI initiator communicates with an SES device using two SCSI commands, Send Diagnostic and Receive Diagnostic Results. The most common SES elements are power-supply, cooling-fan, temperature-sensor and UPS. The SCSI command protocols assume that there may be more than one of each device type so they must each be given an 8-bit address. When the SES controller is interrogated for the status of an SES element, the response includes a 4-bit status code. The most common element status codes are: 1h=OK, 2h=critical, 3h=warning, 5h=not installed.

See the SES article for a more detailed description.

Status codes

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When a SCSI SES controller is interrogated for the status of a SES element, the response includes a 4-bit SCSI element status code. The list of valid codes is:

  • 0h - unsupported - status detection is not implemented for this element
  • 1h - OK - element is installed and no error conditions are known
  • 2h - critical - critical condition is detected
  • 3h - noncritical (warning) - noncritical condition is detected
  • 4h - unrecoverable - unrecoverable condition is detected
  • 5h - not installed - this element is not installed in the enclosure
  • 6h - unknown - sensor has failed or element status is not available
  • 7h - not available - element installed, no known errors, but the element has not been set into operation
  • 8h-Fh - reserved

References

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