Dell PowerVault TL2000 SCSI Reference Guide - Page 46

Parity, Control, Extension

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Parity page (00h) By means of the Parity page the host can enable Parity retries and select the maximum number of retries. Bit 7 6 5 4 3 2 1 0 Byte 0 PS (1) SPF (0) Page Code (00h) 1 Additional Page Length (02h) 2 Reserved Parity Reserved 3 Maximum Parity retries Field descriptions: PS: Parameters Savable. This field is set to one. The media changer can write this page to non-volatile memory. Parity: This bit indicates whether parity retries are enabled or disabled. By factory default parity retries are enabled. Maximum Parity retries: This field indicates the maximum number of retries performed on a parity error during data out, data in, and message out phase. By factory default the number of parity retries is set to 4. The maximum value allowed in the parity retry field is 7. Control Extension page (0Ah) By means of this page the host can retrieve SCSI features provided by the media changer. Byte 0 1 2 3 4 5 6 - 31 Bit 7 PS (0) (MSB) 6 5 4 3 2 1 SPF (1) Page Code (0Ah) Subpage code (01h) Page Length (1Ch) Reserved Reserved Reserved TCMOS SCSIP Initial Priority 0 (LSB) IALUAE Field descriptions: PS: Parameters Savable. This field is set to zero. The media changer cannot write this page to non-volatile memory. SPF: The Sub Page Format (SPF) bit is set to one to indicate this is a subpage. TCMOS: A TCMOS bit set to zero specifies that the timestamp shall not be changed by any method except those defined by this standard. SCSIP: A SCSI precedence (SCSIP) bit set to one specifies that the timestamp changed using a SET TIMESTAMP command shall take precedence over any other methods. 3-32 TL2000 and TL4000 SCSI Reference

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Parity
page
(00h)
By
means
of
the
Parity
page
the
host
can
enable
Parity
retries
and
select
the
maximum
number
of
retries.
Bit
7
6
5
4
3
2
1
0
Byte
0
PS
(1)
SPF
(0)
Page
Code
(00h)
1
Additional
Page
Length
(02h)
2
Reserved
Parity
Reserved
3
Maximum
Parity
retries
Field
descriptions:
PS:
Parameters
Savable.
This
field
is
set
to
one.
The
media
changer
can
write
this
page
to
non-volatile
memory.
Parity:
This
bit
indicates
whether
parity
retries
are
enabled
or
disabled.
By
factory
default
parity
retries
are
enabled.
Maximum
Parity
retries:
This
field
indicates
the
maximum
number
of
retries
performed
on
a
parity
error
during
data
out,
data
in,
and
message
out
phase.
By
factory
default
the
number
of
parity
retries
is
set
to
4.
The
maximum
value
allowed
in
the
parity
retry
field
is
7.
Control
Extension
page
(0Ah)
By
means
of
this
page
the
host
can
retrieve
SCSI
features
provided
by
the
media
changer.
Bit
7
6
5
4
3
2
1
0
Byte
0
PS
(0)
SPF
(1)
Page
Code
(0Ah)
1
Subpage
code
(01h)
2
(MSB)
Page
Length
(1Ch)
3
(LSB)
4
Reserved
TCMOS
SCSIP
IALUAE
5
Reserved
Initial
Priority
6
-
31
Reserved
Field
descriptions:
PS:
Parameters
Savable.
This
field
is
set
to
zero.
The
media
changer
cannot
write
this
page
to
non-volatile
memory.
SPF:
The
Sub
Page
Format
(SPF)
bit
is
set
to
one
to
indicate
this
is
a
subpage.
TCMOS:
A
TCMOS
bit
set
to
zero
specifies
that
the
timestamp
shall
not
be
changed
by
any
method
except
those
defined
by
this
standard.
SCSIP:
A
SCSI
precedence
(SCSIP)
bit
set
to
one
specifies
that
the
timestamp
changed
using
a
SET
TIMESTAMP
command
shall
take
precedence
over
any
other
methods.
3-32
TL2000
and
TL4000
SCSI
Reference