Tandberg Data SLR AUTOLOADER PROGRAMMER, Руководство пользователя, Страница: 43 / 62

Tandberg Data SCSI Commands
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Tandberg SLR Autoloader SCSI Functional Specifications 2-37
2.10.5 Data Transfer Element Status Page
The Data Transfer Element Status page includes an eight-byte header
followed by one or more data transfer element descriptors.
The format of the Data Transfer Element Header follows:
Bit
Byte
7 6 5 4 3 2 1 0
0 Element Type Code (4 = Data Transfer Element)
1 PVolTag AVolTag Reserved
2 Data Transfer Element Descriptor Length (MSB)
3 Data Transfer Element Descriptor Length (LSB)
4 Reserved
5 (MSB)
6 Byte Count of Descriptor Data Available
7 (LSB)
The format of the Data Transfer Element Descriptor follows:
8 Data Transfer Element Address (MSB)
9 Data Transfer Element Address (LSB)
10 Reserved Access Except Reserved Full
11 Reserved
12 Additional Sense Code
13 Additional Sense Code Qualifier
14 Not Bus Reserved ID Valid LU Valid Reserved Logical Unit Number
15 SCSI Bus Address
16 Reserved
17 SValid Invert Reserved
18 Source Storage Element Address (MSB)
19 Source Storage Element Address (LSB)
20-55 Primary Volume Tag Information (field omitted if PVolTag = 0)
56-59 Reserved (field moved up if PVolTag = 0)
60-n Descriptors for other Data Transfer Elements Reported
Element Address
The element address field gives the address of the data transfer element.
Access
An access bit value of one indicates access to the element by a medium
transport element is allowed (the tape drive is installed). An access bit of
zero indicates access to the element by the medium transport element is
denied.
NOTE:
This bit will be set to zero when the data transfer element is full if the Explicit
Unload option is selected in the library menu and the tape has not been unloaded
using the SCSI UNLOAD command.