
15-4
SCSI REFERENCE 1014826
CHAPTER 15—READ ELEMENT STATUS (B8h)
15.3.1 ELEMENT STATUS HEADER
This header is returned once for each READ ELEMENT STATUS command
received by the library.
First Element Address Reported – Bytes 00 and 01
This field indicates the smallest element address found that meets the CDB
requirements.
Number of Elements Reported – Bytes 02 and 03
This field indicates the total number of elements that meet the CDB
requirements. The library returns element descriptors for these elements if
you specified a sufficient Allocation Length.
Byte Count of Report Available – Bytes 05 through 07
This field indicates the total number of bytes of element status page data
available that meet the CDB requirements. This value is not adjusted to match
the value that you specified for the Allocation Length field in the CDB.
15.3.2 ELEMENT STATUS PAGE
The library returns one Element Status page for each group of element
descriptors of the same type (that is, it returns one page for each of the
following: cartridge loader, cartridge storage locations, I/E ports, and tape
drives). The Element Status page is returned only if there is at least one
Element Descriptor also being returned.
Bit
Byte
7 6 5 4 3 2 1 0
00 (MSB)
First Element Address Reported
(LSB)
01
02 (MSB)
Number of Elements Reported
(LSB)
03
04 Reserved
05 (MSB)
Byte Count of Report Available
(LSB)
06
07
Bit
Byte
7 6 5 4 3 2 1 0
00 Element Type Code
01 PVolTag AVolTag Reserved
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