SCSI Primary Commands - 2.pdf

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T10/1236-D Revision 20 18 July 2001The DESCRIPTOR LENGTH field shall contain the length in bytes of the fields that follow the DESCRIPTOR LENGTH field,including the embedded data. The value in the DESCRIPTOR LENGTH field shall be a multiple of 4.The DESTINATION TARGET DESCRIPTOR INDEX field is described in 7.2.7.1.The STREAM DEVICE TRANSFER LENGTH field specifies the amount of data to be written to the stream device on eachwrite operation. See 7.2.6.8 for a description of how data in the STREAM DEVICE TRANSFER LENGTH field in thesegment descriptor interacts with data in the STREAM BLOCK LENGTH field in the device type specific targetdescriptor parameters for the destination sequential-access device type.The EMBEDDED DATA NUMBER OF BYTES field specifies the number of bytes of embedded data that are to be transferredto the stream device. A value of zero shall not be considered an error. The EMBEDDED DATA NUMBER OFBYTES value shall be less than or equal to the DESCRIPTOR LENGTH value minus 12.7.2.7.9 Stream device to discard operationThe segment descriptor format shown in table 36 instructs the copy manager to read data from a stream deviceand not copy it to any destination device.Table 36 — Stream device to discard segment descriptorBitByte7 6 5 4 3 2 1 00 DESCRIPTOR TYPE CODE (06h or 0Fh)1 Reserved CAT2 (MSB)DESCRIPTOR LENGTH (000Ch)3 (LSB)4 (MSB)SOURCE TARGET DESCRIPTOR INDEX5 (LSB)6 Reserved7 Reserved8 Reserved9 (MSB)10STREAM DEVICE TRANSFER LENGTH11 (LSB)12 (MSB)NUMBER OF BYTES15 (LSB)The DESCRIPTOR TYPE CODE field is described in 7.2.5 and 7.2.7.1. Two DESCRIPTOR TYPE CODE values use thesegment descriptor format shown in table 36 and described in this subclause.For descriptor type code 06h (stream→discard) or descriptor type code 0Fh (stream→discard+application client),the copy manager shall read data as necessary from the source stream device identified by the SOURCE TARGETDESCRIPTOR INDEX field starting at the current position of the source stream device. The number of bytes indicatedby the NUMBER OF BYTES field shall be removed from the source data, starting with any residual source data fromthe previous segment.70 dpANS SCSI Primary Commands - 2 (SPC-2)
18 July 2001 T10/1236-D Revision 20For descriptor type code 06h (stream→discard) the removed data shall be discarded and not written to any destinationdevice. For descriptor type code 0Fh (stream→discard+application client) the removed data shall be heldfor delivery to the application client upon completion of the EXTENDED COPY command in response to aRECEIVE COPY RESULTS command with RECEIVE DATA service action as described in 7.14.3. The minimumamount of held data supported by the copy manager is returned in the response data for the RECEIVE COPYRESULTS command with OPERATING PARAMETERS service action (see 7.14.4). If the copy manager supportsthe 0Fh (stream→discard+application client) descriptor type code it also shall support the RECEIVE COPYRESULTS command with RECEIVE DATA service action.The CAT bit is described in 7.2.7.2.The DESCRIPTOR LENGTH field shall contain 12 (000Ch). The DESTINATION TARGET DESCRIPTOR INDEX field isdescribed in 7.2.7.1.The SOURCE STREAM DEVICE TRANSFER LENGTH field specifies the amount of data to be read from the source streamdevice on each read operation. See 7.2.6.8 for a description of how data in the SOURCE STREAM DEVICE TRANSFERLENGTH field in the segment descriptor interacts with data in the STREAM BLOCK LENGTH field in the device typespecific target descriptor parameters for the source sequential-access device type.The NUMBER OF BYTES field specifies the number of bytes to be removed from the source data.7.2.7.10 Verify device operationThe segment descriptor format shown in table 37 instructs the copy manager to verify the accessibility of a SCSIdevice.Table 37 — Verify device operation segment descriptorBitByte7 6 5 4 3 2 1 00 DESCRIPTOR TYPE CODE (07h)1 Reserved2 (MSB)DESCRIPTOR LENGTH (0008h)3 (LSB)4 (MSB)SOURCE TARGET DESCRIPTOR INDEX5 (LSB)67Reserved8 Reserved TUR911ReservedThe DESCRIPTOR TYPE CODE field is described in 7.2.5 and 7.2.7.1. Descriptor type code 07h instructs the copymanager to verify the accessibility of the device identified by the SOURCE TARGET DESCRIPTOR INDEX field.The DESCRIPTOR LENGTH field shall contain 8 (0008h). The SOURCE TARGET DESCRIPTOR INDEX field is described in7.2.7.1.dpANS SCSI Primary Commands - 2 (SPC-2) 71
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