Dell PowerVault TL4000 SCSI Reference Guide - Page 45

Parameter, Header

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3Fh 00h 68 All pages 3Fh FFh 100 All pages including subpages Returns all Mode Sense pages in incrementing order. Returns all Mode Sense pages including subpages in incrementing order. Note: The number bytes column does not include the Parameter List Header and the (optional) Block Descriptor. A page code of 3Fh indicates that all mode pages shall be returned to the application client. These pages will be returned in ascending order except for Mode Page 00h. Mode Page 00h shall be returned after all other Mode Pages. Mode Parameter List Each Mode Sense page begins with a four byte Parameter List Header, and optionally followed by an eight byte Block Descriptor before one or all Mode Sense pages are returned. Bit 7 6 5 4 3 2 1 0 Byte 0 - 3 Mode Parameter Header 4 - n Mode Sense Page(s) Mode Parameter Header Each Mode Sense page begins with a four byte Mode Parameter Header. This header has the following structure: Bit 7 6 5 4 3 2 1 0 Byte 0 Mode Data Length 1 Reserved 2 Reserved 3 Block Descriptor Length Field descriptions: Mode Data Length: This field indicates the number of bytes of parameter information the media changer is returning as a result of this command, excluding the Mode Data Length but including the three additional Parameter List Header bytes. If a block descriptor was requested this count is also added to the Mode Data Length. Block Descriptor Length: If the DBD bit is cleared in the CDB the media changer may return an eight byte Block Descriptor. When a Block Descriptor is returned the Block Descriptor Length will report 8. When the DBD bit is set the media changer will not return Block Descriptors and therefore the Block Descriptor Length will report 0. Chapter 3. Supported SCSI Commands 3-31

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3Fh
00h
68
All
pages
Returns
all
Mode
Sense
pages
in
incrementing
order.
3Fh
FFh
100
All
pages
including
subpages
Returns
all
Mode
Sense
pages
including
subpages
in
incrementing
order.
Note:
The
number
bytes
column
does
not
include
the
Parameter
List
Header
and
the
(optional)
Block
Descriptor.
A
page
code
of
3Fh
indicates
that
all
mode
pages
shall
be
returned
to
the
application
client.
These
pages
will
be
returned
in
ascending
order
except
for
Mode
Page
00h.
Mode
Page
00h
shall
be
returned
after
all
other
Mode
Pages.
Mode
Parameter
List
Each
Mode
Sense
page
begins
with
a
four
byte
Parameter
List
Header,
and
optionally
followed
by
an
eight
byte
Block
Descriptor
before
one
or
all
Mode
Sense
pages
are
returned.
Bit
7
6
5
4
3
2
1
0
Byte
0
-
3
Mode
Parameter
Header
4
-
n
Mode
Sense
Page(s)
Mode
Parameter
Header
Each
Mode
Sense
page
begins
with
a
four
byte
Mode
Parameter
Header.
This
header
has
the
following
structure:
Bit
7
6
5
4
3
2
1
0
Byte
0
Mode
Data
Length
1
Reserved
2
Reserved
3
Block
Descriptor
Length
Field
descriptions:
Mode
Data
Length:
This
field
indicates
the
number
of
bytes
of
parameter
information
the
media
changer
is
returning
as
a
result
of
this
command,
excluding
the
Mode
Data
Length
but
including
the
three
additional
Parameter
List
Header
bytes.
If
a
block
descriptor
was
requested
this
count
is
also
added
to
the
Mode
Data
Length.
Block
Descriptor
Length:
If
the
DBD
bit
is
cleared
in
the
CDB
the
media
changer
may
return
an
eight
byte
Block
Descriptor.
When
a
Block
Descriptor
is
returned
the
Block
Descriptor
Length
will
report
8.
When
the
DBD
bit
is
set
the
media
changer
will
not
return
Block
Descriptors
and
therefore
the
Block
Descriptor
Length
will
report
0.
Chapter
3.
Supported
SCSI
Commands
3-31