Dell PowerVault TL4000 SCSI Reference Guide - Page 69

Medium, Transport, Element, Status

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Bit 7 6 5 4 3 2 1 0 Byte 4 Reserved 5 - 7 Byte Count of Descriptor Data Available Field descriptions: Element Type Code: This field specifies the element type of the next element descriptor(s). The supported element type descriptors are: 1h Medium Transport Element 2h Storage Element 3h Import / Export Element 4h Data Transfer Element PVolTag: Primary Volume Tag. If the PVolTag bit is set, the device returns Primary Volume Tag information in the Storage and Data Transfer Element descriptors. AVolTag: Alternate Volume Tag. The library does not support dual sided media. Therefore the Alternate Volume Tag label is always set to zero even when the VolTag bit is set in the CDB. Element Descriptor Length: This field indicates the number of bytes in each element descriptor. Byte Count of Descriptor Data Available: This field indicates the number of bytes of element descriptor data available for elements of this element type that meet the request in the CDB. The value is not adjusted to match the allocation length available. The element descriptors include the element address and status flags for the elements and may also contain sense code information and/or other information depending on the element type. The following subsections describe each of the possible element descriptors. Medium Transport Element Status Page (01h) The Medium Transport Element is the device that physically moves the tapes around in the library. The library has one Medium Transport element. This element can be addressed explicitly with the Medium Transport Element address or, implicitly as address 0. Bit 7 6 5 4 3 2 1 0 Byte Subheader 0 Element Type Code (1h = Medium Transport) 1 PVolTag AVolTag Reserved 2 - 3 Transport Element Descriptor Length 4 Reserved 5 - 7 Byte Count of Descriptor Data Available Element Descriptor 8 - 9 Medium Transport Element Address Chapter 3. Supported SCSI Commands 3-55

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Bit
7
6
5
4
3
2
1
0
Byte
4
Reserved
5
-
7
Byte
Count
of
Descriptor
Data
Available
Field
descriptions:
Element
Type
Code:
This
field
specifies
the
element
type
of
the
next
element
descriptor(s).
The
supported
element
type
descriptors
are:
1h
Medium
Transport
Element
2h
Storage
Element
3h
Import
/
Export
Element
4h
Data
Transfer
Element
PVolTag:
Primary
Volume
Tag.
If
the
PVolTag
bit
is
set,
the
device
returns
Primary
Volume
Tag
information
in
the
Storage
and
Data
Transfer
Element
descriptors.
AVolTag:
Alternate
Volume
Tag.
The
library
does
not
support
dual
sided
media.
Therefore
the
Alternate
Volume
Tag
label
is
always
set
to
zero
even
when
the
VolTag
bit
is
set
in
the
CDB.
Element
Descriptor
Length:
This
field
indicates
the
number
of
bytes
in
each
element
descriptor.
Byte
Count
of
Descriptor
Data
Available:
This
field
indicates
the
number
of
bytes
of
element
descriptor
data
available
for
elements
of
this
element
type
that
meet
the
request
in
the
CDB.
The
value
is
not
adjusted
to
match
the
allocation
length
available.
The
element
descriptors
include
the
element
address
and
status
flags
for
the
elements
and
may
also
contain
sense
code
information
and/or
other
information
depending
on
the
element
type.
The
following
subsections
describe
each
of
the
possible
element
descriptors.
Medium
Transport
Element
Status
Page
(01h)
The
Medium
Transport
Element
is
the
device
that
physically
moves
the
tapes
around
in
the
library.
The
library
has
one
Medium
Transport
element.
This
element
can
be
addressed
explicitly
with
the
Medium
Transport
Element
address
or,
implicitly
as
address
0.
Bit
7
6
5
4
3
2
1
0
Byte
Subheader
0
Element
Type
Code
(1h
=
Medium
Transport)
1
PVolTag
AVolTag
Reserved
2
-
3
Transport
Element
Descriptor
Length
4
Reserved
5
-
7
Byte
Count
of
Descriptor
Data
Available
Element
Descriptor
8
-
9
Medium
Transport
Element
Address
Chapter
3.
Supported
SCSI
Commands
3-55