Dell PowerVault TL4000 SCSI Reference Guide - Page 43

Field, descriptions

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MODE SELECT 10 (55h) The MODE SELECT (10) command provides a means for the host to specify peripheral device parameters to the media changer. Application clients should issue MODE SENSE prior to each MODE SELECT to determine supported pages, page lengths, changeable variables and to determine is the page is savable to NVRAM. For documentation on the supported Mode Select pages refer to the Mode Select (6) description. Byte 0 1 2 3 4 5 6 7 8 9 Bit 7 IMSB) 6 LUN 5 4 3 2 1 Operation Code (55h) PF (1) Reserved Reserved Reserved Reserved Reserved Parameter list length Reserved Control 0 SP (LSB) Field descriptions: PF: A PF bit of one indicates that the MODE SELECT parameters following the header and block descriptor(s) complies with the SCSI-2 specification. The value must be set to 1. SP: A Save Pages (SP) bit of zero indicates the media changer shall perform the specified MODE SELECT operation, and shall not save any pages in non volatile ram. An SP bit of one indicates that the media changer shall perform the specified MODE SELECT operation, and shall save the current values to a non volatile RAM. Chapter 3. Supported SCSI Commands 3-29

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MODE
SELECT
10
(55h)
The
MODE
SELECT
(10)
command
provides
a
means
for
the
host
to
specify
peripheral
device
parameters
to
the
media
changer.
Application
clients
should
issue
MODE
SENSE
prior
to
each
MODE
SELECT
to
determine
supported
pages,
page
lengths,
changeable
variables
and
to
determine
is
the
page
is
savable
to
NVRAM.
For
documentation
on
the
supported
Mode
Select
pages
refer
to
the
Mode
Select
(6)
description.
Bit
7
6
5
4
3
2
1
0
Byte
0
Operation
Code
(55h)
1
LUN
PF
(1)
Reserved
SP
2
Reserved
3
Reserved
4
Reserved
5
Reserved
6
Reserved
7
IMSB)
Parameter
list
length
8
(LSB)
9
Control
Field
descriptions:
PF:
A
PF
bit
of
one
indicates
that
the
MODE
SELECT
parameters
following
the
header
and
block
descriptor(s)
complies
with
the
SCSI-2
specification.
The
value
must
be
set
to
1.
SP:
A
Save
Pages
(SP)
bit
of
zero
indicates
the
media
changer
shall
perform
the
specified
MODE
SELECT
operation,
and
shall
not
save
any
pages
in
non
volatile
ram.
An
SP
bit
of
one
indicates
that
the
media
changer
shall
perform
the
specified
MODE
SELECT
operation,
and
shall
save
the
current
values
to
a
non
volatile
RAM.
Chapter
3.
Supported
SCSI
Commands
3-29