Table B-26: Space Operation Segment Descriptor - Spectra Logic Spectra S50 User Manual

If the write setmark (WSMK) bit is one, the Transfer Length field specifies the number
of setmarks to be written. If the WSMK bit is zero, the Transfer Length field specifies
the number of filemarks to be written.
Space Operation
The segment descriptor format shown in Table B-26 instructs the copy manager to
send a SPACE command to the destination tape device.

Table B-26: Space Operation Segment Descriptor

Bit
Byte 7
0
1
2 (MSB)
3
4
5
6 (MSB)
7
8
9 (MSB)
11
The Descriptor Type Code field is described in Descriptor Type Codes on page 122 and
Segment Descriptors on page 133. Descriptor type code 11h (space->tape) instructs the
copy manager to send a SPACE command to the destination tape device identified by the
Destination Target Descriptor Index field. If the Peripheral Device Type field in the
target descriptor identified by the Destination Target Descriptor Index field does not
contain 01h, the copy manager will terminate the command with a CHECK CONDITION status.
The sense key will be set to COPY ABORTED and the additional sense code will be set to
INVALID OPERATION FOR COPY SOURCE OR DESTINATION.
The Descriptor Length field will contain 8 (0008h). The Destination Target Descriptor
Index field is described in Segment Descriptors on page 133.
The Code and Count field contents in the SPACE command sent to the destination tape
device will be copied from the Code and Count fields in the segment descriptor. All
other fields in the SPACE command sent to the destination tape device that affect the
positioning of the tape will be set to zero.
Appendix B. Extended Copy—83h—SPC2 Specifications
6 5 4
Descriptor Type Code (11h)
Descriptor Length (0008h)
Destination Target Descriptor Index
Reserved
150
3 2
Reserved
Reserved
Reserved
Count
1 0
(LSB)
(LSB)
Code
(LSB)