SCSI Primary Commands - 2.pdf

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T10/1236-D Revision 20 18 July 20017.2.7.5 Block device to block device operationsThe segment descriptor format shown in table 32 is used by the copy operations that move data from a blockdevice to a block device.Table 32 — Block device to block device segment descriptorBitByte7 6 5 4 3 2 1 00 DESCRIPTOR TYPE CODE (02h or 0Dh)1 Reserved DC CAT2 (MSB)DESCRIPTOR LENGTH (0018h)3 (LSB)4 (MSB)SOURCE TARGET DESCRIPTOR INDEX5 (LSB)6 (MSB)DESTINATION TARGET DESCRIPTOR INDEX7 (LSB)8 Reserved9 Reserved10 (MSB)BLOCK DEVICE NUMBER OF BLOCKS11 (LSB)12 (MSB)SOURCE BLOCK DEVICE LOGICAL BLOCK ADDRESS19 (LSB)20 (MSB)DESTINATION BLOCK DEVICE LOGICAL BLOCK ADDRESS27 (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 32 and described in this subclause.For descriptor type code 02h (block→block) or descriptor type code 0Dh (block→block+application client), the copymanager shall copy the data from the source block device identified by the SOURCE TARGET DESCRIPTOR INDEX fieldto the destination block device identified by the DESTINATION TARGET DESCRIPTOR INDEX field using the logical blocksstarting at the location identified by the SOURCE BLOCK DEVICE LOGICAL BLOCK ADDRESS field. The data shall bewritten to logical blocks starting at the location identified by the DESTINATION BLOCK DEVICE LOGICAL BLOCK ADDRESSfield.If the DC bit equals zero, as many blocks shall be read as necessary to process (see 7.2.7.2) a number of bytesequal to the contents of the DISK BLOCK LENGTH field in the target descriptor for the source device times the contentsof the BLOCK DEVICE NUMBER OF BLOCKS field, and as many writes as possible shall be performed using any residualdestination data from the previous segment and the data processed in this segment. If the DC bit equals one, thenumber of blocks specified by the BLOCK DEVICE NUMBER OF BLOCKS field shall be written to the destination blockdevice, as many bytes shall be processed as necessary for these writes to be performed, and as many blocks shallbe read as necessary to supply the data to be processed.For descriptor type code 0Dh (block→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 7.14.3.64 dpANS SCSI Primary Commands - 2 (SPC-2)
18 July 2001 T10/1236-D Revision 20The 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 0Dh 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 destination count (DC) bit indicates whether the BLOCK DEVICE NUMBER OF BLOCKS field refers to the source ordestination device. A DC bit of zero indicates that the BLOCK DEVICE NUMBER OF BLOCKS field refers to the sourcedevice. A DC bit of one indicates that the BLOCK DEVICE NUMBER OF BLOCKS field refers to the destination device.The DESCRIPTOR LENGTH field shall contain 24 (0018h). The SOURCE TARGET DESCRIPTOR INDEX and DESTINATIONTARGET DESCRIPTOR INDEX fields are described in 7.2.7.1.The BLOCK DEVICE NUMBER OF BLOCKS field specifies the number of blocks to be processed (if DC is set to zero) or tobe written to the destination device (if DC is set to one). A value of zero shall not be considered as an error. If theDC bit equals one, a value of zero indicates that no destination blocks shall be written and the only processing to beperformed is that any residual source or destination data from the previous segment shall be handled as residualdata as described in 7.2.7.2. If the DC bit equals zero, a value of zero indicates that no source blocks shall be readand no source data shall be processed, but any residual destination data from a previous segment shall be writtenif possible to the destination in whole-block transfers, and any residual data shall be handled as described in7.2.7.2.The SOURCE BLOCK DEVICE LOGICAL BLOCK ADDRESS field specifies the logical block address from which the readingof data shall start.The DESTINATION BLOCK DEVICE LOGICAL BLOCK ADDRESS field specifies the logical block address to which the writingof data shall begin.dpANS SCSI Primary Commands - 2 (SPC-2) 65
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