Read Element Status
96122 • Revision: F Chapter 6 SCSI Commands 185
Element Status Page Header Definitions:
Element Type Code This field indicates the specific element type being reported by this element
descriptor page.
The types are:
■ 01h = Medium Transport Element (hand)
■ 02h = Storage Element (cartridge tape storage cells)
■ 03h = Import/Export Element (CAP cells)
■ 04h = Data Transfer Element (tape drive)
PVolTag This bit indicates if primary volume tag (PVolTag) information has been
requested and is present. The possible values indicate:
■ 0 = Volume Tag information has not been requested. The data is omitted from
the element descriptors.
■ 1 = Volume Tag information has been requested to be reported and is present.
AVo l Ta g The library does not support alternative volume tags (AVolTag) and
returns a value of 0.
Element Descriptor
Length
This field indicates the total number of bytes contained in a single
element descriptor.
Byte Count of Descriptor
Data Available
This field indicates the total number of bytes of element descriptor data
available for the elements of this element type that meet the requirements of the
Read Element Status command. This count does not include the Element Status
Page header bytes.
This value is not adjusted to match the allocation length.
Element Descriptors
The following sections contain the field definitions for the four types of library
elements, which are:
■ Medium Transport Element (the hand)
■ Storage Element (cartridge tape storage cells)
■ Import/Export Element (CAP cells and PTP cells)
■ Data Transfer Element (tape drives)
Each element descriptor includes the element address and status flags. Each
element descriptor might also contain sense key information as well as other
information, depending on the element type.
The element descriptors for the four types of elements are similar, with the
exception of a few fields. Note: The differences in Bytes 02, 06, and 07 for the
four element descriptors.
The library does not support alternate volume tags. This information is not
included in any of the element descriptors.
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