
19-2
SCSI REFERENCE 1014826
CHAPTER 19—REQUEST VOLUME ELEMENT ADDRESS (B5h)
19.1 ABOUT THIS COMMAND
The REQUEST VOLUME ELEMENT ADDRESS command requests that the
library return the element descriptors created as a result of the SEND
VOLUME TAG (B6h) command. Data is returned in element address order. For
information about the SEND VOLUME TAG command, see Chapter 23.
Note: In a multi-initiator environment, you should reserve the entire library using
the RESERVE (16h or 56h) command before you request element
descriptors. Do not issue the RELEASE (17h or 57h) command until after
you have successfully obtained data with the REQUEST VOLUME
ELEMENT ADDRESS command. You should issue commands in the
following order:
1. RESERVE (16h) for the entire library
2. SEND VOLUME TAG (B6h)
3. REQUEST VOLUME ELEMENT ADDRESS (B5h)
4. RELEASE (17h)
19.2 WHAT YOU SEND TO THE LIBRARY
VolTag – Byte 01, Bit 4
This field indicates whether you want the library to return the volume tag (bar
code label) information searched for by the SEND VOLUME TAG (B6h)
command. Volume tag information is obtained when the library scans the bar
code label affixed to each cartridge in the library. The valid values for this field
are as follows:
Note: For specifications for the bar code labels that can be used with the library,
refer to the Tandberg Data Bar Code Specification for LTO Ultrium
Cartridges.
Element Type Code – Byte 01, Bits 3 through 0
This field specifies the particular element types you want the library to report
on. The library supports the following Element Type Codes:
0 Do not report volume tag information
1 Report volume tag information
0h All element types
1h Medium Transport Element (cartridge loader)
2h Storage Element (cartridge cells)
3h I/E Port Element (cartridge access port)
4h Data Transfer Element (tape drives)
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