Dell PowerVault TL4000 SCSI Reference Guide - Page 77

AVolTag, Transfer, Element, Address, Access, Except, Additional, Sense, Qualifier, IDValid, SValid,

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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. Data Transfer Element Address: This field provides the address of the data transfer element of this changer device whose status is reported by this element descriptor block. Access: When 1 indicates that access to the data transfer element by a medium transport element is allowed. If 0 access to the data transfer element by a medium transport element is denied. Note that a value of 1 in this bit may not be sufficient to ensure a successful operation. Access is set to 0 if the drive has an error that would prevent it from being used. For example, if there is a communication failure between the medium changer and the tape drive Access is set to 0. Except: An Except bit of 0 indicates the data transfer element is in a normal state; When set to 1 indicates an abnormal state (information about an abnormal state may be available in the additional sense code and additional sense code qualifier bytes). Full: A Full bit value of 1 indicates that the data transfer element of the changer device contains a tape cartridge. A value of 0 indicates the data transfer element is empty. Additional Sense Code: This field may provide specific information about the abnormal data transfer element state. Additional Sense Code Qualifier: This field may provide more detail about an abnormal data transfer element state. IDValid: The IDValid bit is set to one, the SCSI Bus Address field reports the SCSI address of the Data Transfer Element. SCSI Bus Address: This field returns the SCSI Bus Address of the Data Transfer Element. SValid: Source Valid. When set to 1, indicates that the Source Storage Element Address field and the Invert bit fields are valid. When 0, indicates that the values in these fields are not valid. Invert: The library uses single sided media and does not support inverting of the media. The value reported for this field is 0. ED: An ED bit of one indicates the element is disabled (e.g. the tape drive is not installed or has been logical disabled). An ED bit value of zero indicates the element is enabled. Medium Type: The Medium Type field provides the type of medium currently present in the data transfer element. The next table describes the values for the Medium Types : 0h 1h 2h 3h 4h 5h - 7h Unspecified Data Medium Cleaning Medium Diagnostics Medium WORM Medium Reserved Chapter 3. Supported SCSI Commands 3-63

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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.
Data
Transfer
Element
Address:
This
field
provides
the
address
of
the
data
transfer
element
of
this
changer
device
whose
status
is
reported
by
this
element
descriptor
block.
Access:
When
1
indicates
that
access
to
the
data
transfer
element
by
a
medium
transport
element
is
allowed.
If
0
access
to
the
data
transfer
element
by
a
medium
transport
element
is
denied.
Note
that
a
value
of
1
in
this
bit
may
not
be
sufficient
to
ensure
a
successful
operation.
Access
is
set
to
0
if
the
drive
has
an
error
that
would
prevent
it
from
being
used.
For
example,
if
there
is
a
communication
failure
between
the
medium
changer
and
the
tape
drive
Access
is
set
to
0.
Except:
An
Except
bit
of
0
indicates
the
data
transfer
element
is
in
a
normal
state;
When
set
to
1
indicates
an
abnormal
state
(information
about
an
abnormal
state
may
be
available
in
the
additional
sense
code
and
additional
sense
code
qualifier
bytes).
Full:
A
Full
bit
value
of
1
indicates
that
the
data
transfer
element
of
the
changer
device
contains
a
tape
cartridge.
A
value
of
0
indicates
the
data
transfer
element
is
empty.
Additional
Sense
Code:
This
field
may
provide
specific
information
about
the
abnormal
data
transfer
element
state.
Additional
Sense
Code
Qualifier:
This
field
may
provide
more
detail
about
an
abnormal
data
transfer
element
state.
IDValid:
The
IDValid
bit
is
set
to
one,
the
SCSI
Bus
Address
field
reports
the
SCSI
address
of
the
Data
Transfer
Element.
SCSI
Bus
Address:
This
field
returns
the
SCSI
Bus
Address
of
the
Data
Transfer
Element.
SValid:
Source
Valid.
When
set
to
1,
indicates
that
the
Source
Storage
Element
Address
field
and
the
Invert
bit
fields
are
valid.
When
0,
indicates
that
the
values
in
these
fields
are
not
valid.
Invert:
The
library
uses
single
sided
media
and
does
not
support
inverting
of
the
media.
The
value
reported
for
this
field
is
0.
ED:
An
ED
bit
of
one
indicates
the
element
is
disabled
(e.g.
the
tape
drive
is
not
installed
or
has
been
logical
disabled).
An
ED
bit
value
of
zero
indicates
the
element
is
enabled.
Medium
Type:
The
Medium
Type
field
provides
the
type
of
medium
currently
present
in
the
data
transfer
element.
The
next
table
describes
the
values
for
the
Medium
Types
:
0h
Unspecified
1h
Data
Medium
2h
Cleaning
Medium
3h
Diagnostics
Medium
4h
WORM
Medium
5h
-
7h
Reserved
Chapter
3.
Supported
SCSI
Commands
3-63