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
[edit]- 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
[edit]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
[edit]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
[edit]- StorageSecrets.org - SCSI Enclosure Services (SES & SES-2) Management
- 08-026r0 SES-2 Element control and status nomenclature.fm - T10.org (page 20 and 22)
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