User's Manual

DLT4000 SCSI Interface
DLT4000/DLT4500/DLT4700 Cartridge Tape Subsystem 8-139
8.5.4 READ ELEMENT STATUS (B8h)
Bit
7 6 5 4 3 2 1 0
0 Operation Code (B8h)
1 Logical Unit Number
VolTag
Element type Code
2
(MSB)
Starting Element Address
3
(LSB)
4
(MSB)
Number of Elements
Byte 5
(LSB)
6 Reserved
7
(MSB)
8 Allocation Length
9
(LSB)
10 Reserved
11 Unused Reserved Flag Link
Figure 8-88 READ ELEMENT STATUS CDB
Code Description
0h All element types reported (valid in CDB only)
1h Medium Transport Element
2h Storage Element (magazine slot)
3h Import Export Element (not supported)
4h Data Transfer Element (tape drive)
5 - Fh reserved
Figure 8-89 Element Type Code Definitions
The format of Element Status data is defined in the SCSI-2 specification. The
following sections show the information returned for the medium changer. The
Element Status data is made up of a header, and one or more Status Pages (for each
element type). The Status Pages are made up of a header and one or more element
descriptors (one for each element address). The data shown assumes the CDB was
specified in such a way that all descriptors for a given element type would be returned.
The Primary and Alternate Volume Tag functions are not supported, so the flags
indicating these functions in the Element Status Pages (below) are always set to zero.