Dell PowerVault TL4000 SCSI Reference Guide - Page 93

Request, Volume, Element, Address

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REQUEST VOLUME ELEMENT ADDRESS (B5h) The REQUEST VOLUME ELEMENT ADDRESS command is used to transfer the results of the SEND VOLUME TAG command. Multiple REQUEST VOLUME ELEMENT ADDRESS commands may be used to retrieve the results of a single SEND VOLUME TAG command with the translate option. Bit 7 Byte 0 1 2 (MSB) 3 4 (MSB) 5 6 7 (MSB) 8 9 10 11 6 LUN 5 4 3 2 1 Operation Code (B5h) VolTag Element Address Obsolete Number Elements to Report Reserved Allocation Length Reserved Control 0 (LSB) (LSB) (LSB) For each Send Volume Tag command, the library shall report in response to a Request Volume Element Address command zero or more elements that match a volume tag template in element address order. Once information for a given element address has been reported, only higher element addresses shall be reported by subsequent Request Volume Element Address commands. Field descriptions: VolTag: A VolTag bit of one indicates that the library shall report volume tag information. A value of zero indicates that the volume tag information shall not be reported. Element Address: The Element Address field specifies a media changer element address whose interpretation depends on the Send Action Code field of the last successful Send Volume Tag command. When the Send Action Code field was a translate, the Element Address field gives the minimum element address to be reported by this command. When the Send Action Code field is assert, replace, or undefine, the Element Address field gives the particular element whose volume tag information was modified. Number of Elements to Report: The Number of Elements to Report field specifies the maximum number of elements to report of those that match the last Send Volume Tag command translate template. Allocation Length: If the Allocation Length is not sufficient to transfer all the element descriptors, the library shall only return those descriptors whose complete contents fit within the allocation length. Chapter 3. Supported SCSI Commands 3-79

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REQUEST
VOLUME
ELEMENT
ADDRESS
(B5h)
The
REQUEST
VOLUME
ELEMENT
ADDRESS
command
is
used
to
transfer
the
results
of
the
SEND
VOLUME
TAG
command.
Multiple
REQUEST
VOLUME
ELEMENT
ADDRESS
commands
may
be
used
to
retrieve
the
results
of
a
single
SEND
VOLUME
TAG
command
with
the
translate
option.
Bit
7
6
5
4
3
2
1
0
Byte
0
Operation
Code
(B5h)
1
LUN
VolTag
Obsolete
2
(MSB)
Element
Address
3
(LSB)
4
(MSB)
Number
Elements
to
Report
5
(LSB)
6
Reserved
7
(MSB)
8
Allocation
Length
9
(LSB)
10
Reserved
11
Control
For
each
Send
Volume
Tag
command,
the
library
shall
report
in
response
to
a
Request
Volume
Element
Address
command
zero
or
more
elements
that
match
a
volume
tag
template
in
element
address
order.
Once
information
for
a
given
element
address
has
been
reported,
only
higher
element
addresses
shall
be
reported
by
subsequent
Request
Volume
Element
Address
commands.
Field
descriptions:
VolTag:
A
VolTag
bit
of
one
indicates
that
the
library
shall
report
volume
tag
information.
A
value
of
zero
indicates
that
the
volume
tag
information
shall
not
be
reported.
Element
Address:
The
Element
Address
field
specifies
a
media
changer
element
address
whose
interpretation
depends
on
the
Send
Action
Code
field
of
the
last
successful
Send
Volume
Tag
command.
When
the
Send
Action
Code
field
was
a
translate,
the
Element
Address
field
gives
the
minimum
element
address
to
be
reported
by
this
command.
When
the
Send
Action
Code
field
is
assert,
replace,
or
undefine,
the
Element
Address
field
gives
the
particular
element
whose
volume
tag
information
was
modified.
Number
of
Elements
to
Report:
The
Number
of
Elements
to
Report
field
specifies
the
maximum
number
of
elements
to
report
of
those
that
match
the
last
Send
Volume
Tag
command
translate
template.
Allocation
Length:
If
the
Allocation
Length
is
not
sufficient
to
transfer
all
the
element
descriptors,
the
library
shall
only
return
those
descriptors
whose
complete
contents
fit
within
the
allocation
length.
Chapter
3.
Supported
SCSI
Commands
3-79