SCSI command

SCSI command

In SCSI computer storage, a command is the basic unit of communication. The SCSI command architecture was originally defined for parallel SCSI buses but has been carried forward with minimal change for use with Fibre Channel, iSCSI and Serial Attached SCSI.

In SCSI protocol, the initiator sends a SCSI command to the target which then responds. SCSI commands are sent in a Command Descriptor Block (CDB). The CDB consists of a one byte operation code followed by five or more bytes containing command-specific parameters. At the end of the command the target returns a Status Code byte.

The rest of this article contains a list of SCSI commands, firstly in operation code order and secondly in alphabetical order. There are links to detailed descriptions for the more common SCSI commands:

List of SCSI commands by operation code

List of SCSI commands, alphabetical

External links

* [http://www.t10.org/ftp/t10/drafts/spc4/spc4r02.pdf SPC-4 : comprehensive list of all SCSI 3 commands] (see table D.2 in Annex D)


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