Table B-17: Pad And Cat Bit Definitions - Spectra Logic Spectra S50 User Manual

Table B-17: PAD and CAT Bit Definitions

Pad Bit in ...
Source Destination
Target Target
Descriptor Descriptor
0 or 1 0 or 1
1 1
0 1
1 0
0 0
a. When CAT=0 and the destination target descriptor has PAD=1,the EXTENDED COPY command will be terminated with a CHECK CONDITION status,
the sense key will be set to COPY ABORTED, and the additional sense code will be set to UNEXPECTED INEXACT SEGMENT if any of the following
conditions are met:
1) If any residual destination data is present after writing the designated byte range for a segment descriptor of type 09h (stream->block <o>) or
0Ah (block<o>->block<o>); or
2) If any residual destination data is present after the designated number of blocks have been written for a segment descriptor of type 02h
(block->block) with DC=1, 0Dh (block->block+application client) with DC=1, 01h (stream->block) or 0Ch (stream->block+application client).
A few segment descriptors have either no source or no target and handling of the PAD
bit for those descriptors will be as follows. For segment descriptor types 04h
(inline->stream, see Inline Data to Stream Device Operation on page 143) and 05h
(embedded->stream, see Embedded Data to Stream Device Operation on page 145), the
handling will be as if the PAD were equal to zero for the source target descriptor. For
segment descriptor types 06h and 0Fh (stream->discard and stream->discard
+application client, see Stream Device to Discard Operation on page 147), handling
will be as if the PAD were equal to zero for the destination target descriptor.
The Descriptor Length field contains the length in bytes of the fields that follow the
Descriptor Length field in the segment descriptor. In most cases, the length is constant.
The Source Target Descriptor Index field contains an index into the target descriptor
list identifying the source target device. The Destination Target Descriptor Index field
Appendix B. Extended Copy—83h—SPC2 Specifications
CAT
Bit Copy Manager Action
Any residual source data will be retained as source data for a subsequent segment
descriptor. Any residual destination data will be retained as destination data for a
subsequent segment descriptor. It will not be an error if either the source or destination
1 target index in the following segment descriptor does not match the corresponding
target index with which residual data was originally associated. If the CAT bit is one on
the last segment of an EXTENDED COPY command any residual data will be discarded;
this will not be considered an error.
Any residual source data will be discarded. Any residual destination data will be padded
0
with zeroes to make a whole block transfer.
Any residual source data will be handled as if the CAT bit is equal to one (i.e., discarded
0 on the last segment and retained otherwise). Any residual destination data will be
padded with zeroes to make a whole block transfer.
0 Any residual source or destination data will be discarded.
If there is residual source or destination data the EXTENDED COPY command will be
0 terminated with a CHECK CONDITION status. The sense key will be set to an COPY
ABORTED and the additional sense code will be set to UNEXPECTED INEXACT SEGMENT.
a
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a