Dell PowerVault TL4000 SCSI Reference Guide - Page 53

SENSE, Parameter

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MODE SENSE 10 (5Ah) The MODE SENSE (10) command provides a means for a device server to report parameters to an application client. It is a complementary command to the MODE SELECT command. For documentation on the supported Mode Pages refer to the Mode Sense (6) command. Byte 0 1 2 3 4 5 6 7 8 9 Bit 7 (MSB) 6 LUN PC 5 4 3 2 1 0 Operation Code (5Ah) Reserved DBD Subpage Code Reserved Reserved Reserved Allocation length Page Code Reserved Control (LSB) Field descriptions: DBD: The Disable Block Descriptors bit specifies if the media changer may return block descriptor after the Parameter List Header. The media changer does not support block descriptors, therefore this bit is ignored. PC: The Page Control field defines the type of mode parameter values to be returned in the mode pages. 00b Report Current Values (equal to default values if no pages previously saved) 01b Report changeable values 10b Report Default Values 11b Report Saved Values (equal to default values if no pages previously saved) Page Code: The page code defines which pages should be returned. A Initiator can request one or all mode sense pages. Each response includes four bytes for the Parameter List Header, followed by the specified number of bytes for each page. Mode Parameter List The returned data on a Model Sense (10) command begins with an eight byte Mode Parameter Header followed by one or all Mode Sense pages as requested by the Page Code and Subpage Code fields. Bit 7 6 5 4 3 2 1 0 Byte 0 - 7 Mode Parameter Header 8 - n Mode Sense Page(s) Chapter 3. Supported SCSI Commands 3-39

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MODE
SENSE
10
(5Ah)
The
MODE
SENSE
(10)
command
provides
a
means
for
a
device
server
to
report
parameters
to
an
application
client.
It
is
a
complementary
command
to
the
MODE
SELECT
command.
For
documentation
on
the
supported
Mode
Pages
refer
to
the
Mode
Sense
(6)
command.
Bit
7
6
5
4
3
2
1
0
Byte
0
Operation
Code
(5Ah)
1
LUN
Reserved
DBD
Reserved
2
PC
Page
Code
3
Subpage
Code
4
Reserved
5
Reserved
6
Reserved
7
(MSB)
Allocation
length
8
(LSB)
9
Control
Field
descriptions:
DBD:
The
Disable
Block
Descriptors
bit
specifies
if
the
media
changer
may
return
block
descriptor
after
the
Parameter
List
Header.
The
media
changer
does
not
support
block
descriptors,
therefore
this
bit
is
ignored.
PC:
The
Page
Control
field
defines
the
type
of
mode
parameter
values
to
be
returned
in
the
mode
pages.
00b
Report
Current
Values
(equal
to
default
values
if
no
pages
previously
saved)
01b
Report
changeable
values
10b
Report
Default
Values
11b
Report
Saved
Values
(equal
to
default
values
if
no
pages
previously
saved)
Page
Code:
The
page
code
defines
which
pages
should
be
returned.
A
Initiator
can
request
one
or
all
mode
sense
pages.
Each
response
includes
four
bytes
for
the
Parameter
List
Header,
followed
by
the
specified
number
of
bytes
for
each
page.
Mode
Parameter
List
The
returned
data
on
a
Model
Sense
(10)
command
begins
with
an
eight
byte
Mode
Parameter
Header
followed
by
one
or
all
Mode
Sense
pages
as
requested
by
the
Page
Code
and
Subpage
Code
fields.
Bit
7
6
5
4
3
2
1
0
Byte
0
-
7
Mode
Parameter
Header
8
-
n
Mode
Sense
Page(s)
Chapter
3.
Supported
SCSI
Commands
3-39