Quantum DLT 2000, Руководство по эксплуатации продукта

Страница: 279 / 345

DLT2000 SCSI Interface
DLT2000/DLT2700 Cartridge Tape Subsystem 8-133
8.5.2 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 8-84 READ ELEMENT STATUS CDB
Code Description
0h
1h
2h
3h
4h
5h−Fh All element types reported (valid in CDB only)
Medium Transport Element
Storage Element (magazine slot)
Import Export Element (not supported)
Data Transfer Element (tape drive)
reserved
Figure 8-85 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.