Spectra Logic Spectra S50 User Manual page 120

The Inline Data Length field contains the number of bytes of inline data, after the last
segment descriptor. A value of zero indicates that no inline data is present.
The copy manager will move data from the source devices to the destination devices in
the manner prescribed by the segment descriptors. The specific commands issued by
the copy manager to the source and destination devices while processing the segment
descriptors is vendor-specific. Upon completion of an EXTENDED COPY command that
returns a GOOD status, the source and destination devices (particularly stream devices)
will be positioned at deterministic locations such that the device could be repositioned
to the same location by the application client with appropriate commands.
Errors Detected Before Processing Segment Descriptors
Errors may occur during processing of an EXTENDED COPY command before the first
segment descriptor is processed. These conditions include parity errors while
transferring the EXTENDED COPY command, invalid parameters in the CDB or parameter
data, invalid segment descriptors, and inability of the copy manager to continue
operating. In the event of such an exception condition, the copy manager will:
1. Terminate the EXTENDED COPY command with CHECK CONDITION status; and
2. Set the Valid bit in the sense data to zero. The sense key will contain the sense
key code describing the exception condition (i.e.: not COPY ABORTED).
Errors Detected During Processing Segment Descriptors
Errors may occur after the copy manager has begun processing segment descriptors.
These include invalid parameters in segment descriptors, invalid segment descriptors,
unavailable targets referenced by target descriptors, inability of the copy manager to
continue operating, and errors reported by source or destination target devices. If the
copy manager receives a CHECK CONDITION status from one of the target devices, it will
recover the sense data associated with the exception condition and clear the ACA
condition (if any) associated with the CHECK CONDITION status.
Following an exception condition detected during segment descriptor processing, the
copy manager will:
1. Terminate the EXTENDED COPY command with CHECK CONDITION status;
2. Set the sense key code to COPY ABORTED;
3. Indicate the segment that was being processed at the time of the exception by
writing the segment number to the third and fourth bytes of the Command-
Specific Information field. The segment number is based on the relative position
of the segment descriptor in the EXTENDED COPY parameter list. The first segment
descriptor in the parameter list is assigned descriptor number 0, the second is
assigned 1, etc.;
4. If any data has been transferred for the segment being processed at the time the
error occurred, the residual for the segment will be placed in the Information
Appendix B. Extended Copy—83h—SPC2 Specifications
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