SCSI Primary Commands - 2.pdf

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T10/1236-D Revision 20 18 July 20017.2.7.3 Block device to stream device operationsThe segment descriptor format shown in table 31 is used by the copy operations that move data from a blockdevice to a stream device or vice versa.Table 31 — Block device to or from stream device segment descriptorBitByte7 6 5 4 3 2 1 00 DESCRIPTOR TYPE CODE (00h, 01h, 0Bh, or 0Ch)1 Reserved CAT2 (MSB)DESCRIPTOR LENGTH (0014h)3 (LSB)4 (MSB)SOURCE TARGET DESCRIPTOR INDEX5 (LSB)6 (MSB)DESTINATION TARGET DESCRIPTOR INDEX7 (LSB)8 Reserved9 (MSB)10STREAM DEVICE TRANSFER LENGTH11 (LSB)12 Reserved13 Reserved14 (MSB)BLOCK DEVICE NUMBER OF BLOCKS15 (LSB)16 (MSB)BLOCK DEVICE LOGICAL BLOCK ADDRESS23 (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 31 and described in this subclause.For descriptor type code 00h (block→stream) or descriptor type code 0Bh (block→stream+application client), thecopy manager shall copy the data from the source block device identified by the SOURCE TARGET DESCRIPTOR INDEXfield to the destination stream device identified by the DESTINATION TARGET DESCRIPTOR INDEX field using the logicalblocks starting at the location identified by the BLOCK DEVICE LOGICAL BLOCK ADDRESS field. As many blocks shall beread as necessary to process (see 7.2.7.2) a number of bytes equal to the contents of the DISK BLOCK LENGTH fieldin the target descriptor for the source device times the contents of the BLOCK DEVICE NUMBER OF BLOCKS field. Thedata shall be written to the stream device starting at the current position of the media.For descriptor type code 0Bh (block→stream+application client), the copy manager also shall hold a copy of theprocessed data for delivery to the application client upon completion of the EXTENDED COPY command inresponse to a RECEIVE COPY RESULTS command with RECEIVE DATA service action as described in 7.14.3.The minimum amount of held data supported by the copy manager is returned in the response data for theRECEIVE COPY RESULTS command with OPERATING PARAMETERS service action (see 7.14.4). If the copymanager supports the 0Bh descriptor type code it also shall support the RECEIVE COPY RESULTS commandwith RECEIVE DATA service action.62 dpANS SCSI Primary Commands - 2 (SPC-2)
18 July 2001 T10/1236-D Revision 20The CAT bit is described in 7.2.7.2.The DESCRIPTOR LENGTH field shall contain 20 (0014h). The SOURCE TARGET DESCRIPTOR INDEX and DESTINATIONTARGET DESCRIPTOR INDEX fields are described in 7.2.7.1.The STREAM DEVICE TRANSFER LENGTH field specifies the amount of data to be written on each write operation to thestream device. 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 sequential-access device type.The BLOCK DEVICE NUMBER OF BLOCKS field specifies the length, in source logical blocks, of data to be processed(see 7.2.7.2) in the segment. A value of zero shall not be considered as an error. No data shall be processed, butany residual destination data retained from a previous segment shall be written if possible to the destination inwhole-block transfers. A value of zero shall not modify the handling of residual data.The BLOCK DEVICE LOGICAL BLOCK ADDRESS field specifies the starting logical block address on the block device forthis segment.7.2.7.4 Stream device to block device operationsThe segment descriptor format shown in table 31 (see 7.2.7.3) also is used by the copy operations that move datafrom a stream device to a block device. Two DESCRIPTOR TYPE CODE values use the segment descriptor formatshown in table 31 and described in this subclause.For descriptor type code 01h (stream→block) or descriptor type code 0Ch (stream→block+application client), thecopy manager shall copy the data from the source stream device identified by the SOURCE TARGET DESCRIPTORINDEX field to the destination block device identified by the DESTINATION TARGET DESCRIPTOR INDEX field using thestream data starting at the current position of the stream device. The data shall be written to logical blocks startingat the location identified by the BLOCK DEVICE LOGICAL BLOCK ADDRESS field and continuing for the number of blocksspecified in the BLOCK DEVICE NUMBER OF BLOCKS field.For descriptor type code 0Ch (stream→block+application client), the copy manager also shall hold a copy of theprocessed data for delivery to the application client upon completion of the EXTENDED COPY command inresponse to a RECEIVE COPY RESULTS command with RECEIVE DATA service action as described in 7.14.3.The minimum amount of held data supported by the copy manager is returned in the response data for theRECEIVE COPY RESULTS command with OPERATING PARAMETERS service action (see 7.14.4). If the copymanager supports the 0Ch descriptor type code it also shall support the RECEIVE COPY RESULTS commandwith RECEIVE DATA service action.The CAT bit is described in 7.2.7.2.The DESCRIPTOR LENGTH field shall contain 20 (0014h). The SOURCE TARGET DESCRIPTOR INDEX and DESTINATIONTARGET DESCRIPTOR INDEX fields are described in 7.2.7.1.The STREAM DEVICE TRANSFER LENGTH field specifies the amount of data to be read from the source stream deviceon each read operation. See 7.2.6.8 for a description of how data in the STREAM DEVICE TRANSFER LENGTH field inthe segment descriptor interacts with data in the STREAM BLOCK LENGTH field in the device type specific targetdescriptor parameters for the sequential-access device type.The BLOCK DEVICE NUMBER OF BLOCKS field specifies the number blocks to be written by the segment. A value ofzero indicates that no blocks shall be written in this segment. This shall not be considered as an error.The BLOCK DEVICE LOGICAL BLOCK ADDRESS field specifies the starting logical block address on the block device forthis segment.dpANS SCSI Primary Commands - 2 (SPC-2) 63
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