Mode select 6 (15h), Mode, Select – Dell PowerVault TL4000 User Manual
Page 35: 15h)
MODE
SELECT
6
(15h)
The
MODE
SELECT
(6)
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.
Bit
7
6
5
4
3
2
1
0
Byte
0
Operation
Code
(15h)
1
LUN
PF
(1)
Reserved
SP
2
Reserved
3
Reserved
4
Parameter
list
length
5
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
nonvolatile
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
nonvolatile
RAM.
When
a
host
has
successfully
issued
the
MODE
SELECT
CDB
that
changed
settings
in
one
of
the
Mode
pages,
the
media
changer
will
raise
a
Unit
Attention
condition
to
every
other
host
who
has
not
issued
this
CDB.
The
sense
data
for
these
hosts
will
be
set
to:
Mode
Parameters
Changed
(06/2A/01)
The
host
provides
the
parameters
through
a
parameter
list
to
the
media
changer.
The
parameter
list
consists
of
the
following
items:
v
Parameter
List
Header
v
Mode
Select
page(s)
Supported
Mode
Select
pages:
Page
Code
Subpage
Code
Page
Name
Page
saveable
in
NVRAM
Page
Description
00h
00h
Parity
Retry
page
Yes
Provides
means
to
select
the
maximum
number
retries
performed
on
a
parity
error.
0Ah
01h
Control
Extension
page
No
Provides
a
means
to
read
out
the
capabilities
of
the
SET
TIMESTAMP
and
REPORT
TIMESTAMP
commands.
1Ch
00h
Tape
Alert
page
No
Provides
means
to
select
a
specific
way
to
report
a
Tape
Alert
event
.
1Dh
00h
Element
Address
Assignment
page
Yes
Provides
a
means
to
change
SCSI
element
address
assignments
and
respective
element
ranges.
1Eh
00h
Transport
Geometry
page
No
Provides
a
means
to
set
the
specifics
about
the
Transport
Element.
(not
changeable).
Chapter
3.
Supported
SCSI
Commands
3-21