
15-6
SCSI REFERENCE 1014826
CHAPTER 15—READ ELEMENT STATUS (B8h)
Byte Count of Descriptor Data Available – Bytes 05 through 07
This field indicates the total number of bytes of element descriptor data
available for the elements of this element type that meet the CDB
requirements. This value is the Element Descriptor Length multiplied by the
number of element descriptors. This value is not adjusted to match the value
that you specified in the Allocation Length field of the CDB.
15.3.3 ELEMENT DESCRIPTORS
The following sections contain the field definitions for the four types of
element descriptors for the library:
Medium transport element: The cartridge loader
Storage elements: The cartridge cells
I/E port element(s): The cartridge access port
Data transfer element: The tape drive
Each element descriptor includes the element address and status flags. Each
element descriptor can also contain sense code information as well as other
information, depending on the element type.
Notes:
The element descriptors for the elements are very similar, with the exception of
a few of the fields. Note the differences in bytes 02, 06, and 07 for the element
descriptors.
The library does not support alternate volume tags. This information is not
included in any of the element descriptors.
101 72
110 98
111 108
Table 15-1 Element descriptor length for the data transfer element
DVCID VolTag S/N Req Element Descriptor Length (bytes)
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