Dell PowerVault TL4000 SCSI Reference Guide - Page 36

Select, Parameter, Header, Parity

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1Fh 00h 20h 00h Device Capabilities No page Event Filter page Yes (Vendor Specific) Provides a means to set the media changers capabilities. (not changeable). This page provides a means to mask certain error event types from the event logging of the SCSI controller. Mode Select Parameter List The Mode Select parameter list shown below, contains a 4-byte header, followed by an optional 8 byte block descriptor after which the Mode Select pages are specified. Bit 7 6 5 4 3 2 1 0 Byte 0 - 3 Parameter List Header 4 - n Mode Select page(s) Parameter List Header If you send any page(s) using the Mode Select command to the media changer you must first send the Parameter List Header, followed by the requested Mode Select page(s). The Parameter List Header has the following format: Bit 7 6 5 4 3 2 1 0 Byte 0 Reserved 1 Reserved 2 Reserved 3 Block Descriptor Length (0) If no Block Descriptor is to be sent to the media changer specify zero as Block Descriptor Length in the Parameter Header. After the Parameter List Header the application client can send zero, one or more Mode Select Pages to the media changer to configure any required parameter. Parity page (00h) By means of the Parity page the host can enable Parity retries and select the maximum number of retries. Note this page will be stored in non volatile memory when the Host enables the SP bit in the CDB. Bit 7 6 5 4 3 2 1 0 Byte 0 Reserved SPF (0) Page Code (00h) 1 Additional Page Length (02h) 2 Reserved Parity Reserved 3 Maximum Parity retries Field descriptions: 3-22 TL2000 and TL4000 SCSI Reference

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1Fh
00h
Device
Capabilities
page
No
Provides
a
means
to
set
the
media
changers
capabilities.
(not
changeable).
20h
00h
Event
Filter
page
(Vendor
Specific)
Yes
This
page
provides
a
means
to
mask
certain
error
event
types
from
the
event
logging
of
the
SCSI
controller.
Mode
Select
Parameter
List
The
Mode
Select
parameter
list
shown
below,
contains
a
4-byte
header,
followed
by
an
optional
8
byte
block
descriptor
after
which
the
Mode
Select
pages
are
specified.
Bit
7
6
5
4
3
2
1
0
Byte
0
-
3
Parameter
List
Header
4
-
n
Mode
Select
page(s)
Parameter
List
Header
If
you
send
any
page(s)
using
the
Mode
Select
command
to
the
media
changer
you
must
first
send
the
Parameter
List
Header,
followed
by
the
requested
Mode
Select
page(s).
The
Parameter
List
Header
has
the
following
format:
Bit
7
6
5
4
3
2
1
0
Byte
0
Reserved
1
Reserved
2
Reserved
3
Block
Descriptor
Length
(0)
If
no
Block
Descriptor
is
to
be
sent
to
the
media
changer
specify
zero
as
Block
Descriptor
Length
in
the
Parameter
Header.
After
the
Parameter
List
Header
the
application
client
can
send
zero,
one
or
more
Mode
Select
Pages
to
the
media
changer
to
configure
any
required
parameter.
Parity
page
(00h)
By
means
of
the
Parity
page
the
host
can
enable
Parity
retries
and
select
the
maximum
number
of
retries.
Note
this
page
will
be
stored
in
non
volatile
memory
when
the
Host
enables
the
SP
bit
in
the
CDB.
Bit
7
6
5
4
3
2
1
0
Byte
0
Reserved
SPF
(0)
Page
Code
(00h)
1
Additional
Page
Length
(02h)
2
Reserved
Parity
Reserved
3
Maximum
Parity
retries
Field
descriptions:
3-22
TL2000
and
TL4000
SCSI
Reference