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iSCSI: The Universal Storage Connection by John L. Hufferd

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10. Task Management

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This is another very technical chapter, so again, if you only want an overview, just skip to the Chapter Summary.

Task is another key concept within SCSI. A task is a command or set of commands that may or may not be linked via a “link” bit in the command description block (CDB).

Tagged and Untagged Tasks

Each task is classified as “tagged” or “untagged.” The SCSI initiator will allow only one untagged SCSI task to be outstanding/in process/in flight for any specific LU, but it will allow many tagged tasks to be outstanding/in process/ in flight. The individual tagged commands, or the first one in ...

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