Hitachi HUS154530VLF400, HUS154545VLF400 18.3 Task Attributes

Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification

109

This field contains information describing only the protocol failures detected during the execution of an IOP.

Table 96:FCP_RSP_INFO field

The content of the RSP_CODE field is defined below.

Table 97:RSP_CODE definitions

This field contains the Sense information specified by SCSI (see 22.1, “SCSI Sense Data Format”, on page 349).

FCP_SNS_INFO is only returned if the SCSI Status byte in the FCP_STATUS field is set to CHECK CONDITION status.

Refer to 18.5.3, “Autosense”, on page 113 for more details.

18.3 Task Attributes

Task Attributes are specified in the Task Codes field of the FCP_CMND IU. They apply only to the SCSI command contained

within the FCP_CDB field and are ignored if any of the Task Management function flags are set.

A task shall have one of the following attributes:

Simple Queue

This attribute specifies that the task shall be accepted into the task set and executed after tasks with the Head of

Queue attribute and tasks with the Ordered attribute that were received earlier. The order of execution, with respect to

other tasks with the Simple attribute, is determined by the Queue Algorithm currently in effect. Refer to the Queue

Algorithm Modifier field in 19.10.9, “Mode Page 0A (Control Mode Page Parameters)”, on page 186.

Head of Queue

This attribute specifies that the task shall be accepted into the task set and executed next. Successive tasks received

with Head of Queue attribute will be executed in LIFO order.

Byte Description Size (Bytes)

0-2 Reserved 3

3 RSP_CODE 1

Code Description

00h No Failure (Function Complete)

01h FCP_DATA length different from BURST_LEN

02h FCP_CMND Fields Invalid

03h FCP_DATA_RO mismatch with FCP_XFER_RDY DATA_RO

04h Function Rejected

05h Service Delivery or Target Failure

06-FFh Reserved