Dell PowerVault TL4000 SCSI Reference Guide - Page 37

Control, Extension, Alert

Get Dell PowerVault TL4000 PDF manuals and user guides View all Dell PowerVault TL4000 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 37 highlights

Parity: By means of this field the host can enable parity retires. Parity retries are by factory default enabled by the media changer. When cleared parity retries are disabled. 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. The number of parity retries is by factory default 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 control SCSI features provided by the media changer. Byte 0 1 2 3 4 5 6 - 31 Bit 7 Reserved (MSB) 6 5 SPF (1) Reserved Reserved 4 3 2 1 Page Code (0Ah) Subpage code (31h) Page Length (1Ch) Reserved TCMOS SCSIP Initial Priority 0 (LSB) IALUAE Field descriptions: 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. IALUAE: The implicit asymmetric logical unit access enabled (IALUAE) bit must be set to zero. The media changer does not allow implicit asymmetric logical unit access state changes. Tape Alert Page (1Ch) By means of this page the Host can specify the method of reporting Tape Alert events. Currently only the polling method is supported. Byte 0 1 2 3 4 - 7 8 - 11 Bit 7 Reserved Perf (0) 6 5 4 3 2 1 SPF (0) Page Code (1Ch) Additional Page Length (0Ah) Reserved Dexcpt Test (0) Reserved Reserved MRIE (0) Internal Timer Report Count / Test Flag Number 0 LogErr Chapter 3. Supported SCSI Commands 3-23

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
Parity:
By
means
of
this
field
the
host
can
enable
parity
retires.
Parity
retries
are
by
factory
default
enabled
by
the
media
changer.
When
cleared
parity
retries
are
disabled.
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.
The
number
of
parity
retries
is
by
factory
default
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
control
SCSI
features
provided
by
the
media
changer.
Bit
7
6
5
4
3
2
1
0
Byte
0
Reserved
SPF
(1)
Page
Code
(0Ah)
1
Subpage
code
(31h)
2
(MSB)
Page
Length
(1Ch)
3
(LSB)
4
Reserved
TCMOS
SCSIP
IALUAE
5
Reserved
Initial
Priority
6
-
31
Reserved
Field
descriptions:
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.
IALUAE:
The
implicit
asymmetric
logical
unit
access
enabled
(IALUAE)
bit
must
be
set
to
zero.
The
media
changer
does
not
allow
implicit
asymmetric
logical
unit
access
state
changes.
Tape
Alert
Page
(1Ch)
By
means
of
this
page
the
Host
can
specify
the
method
of
reporting
Tape
Alert
events.
Currently
only
the
polling
method
is
supported.
Bit
7
6
5
4
3
2
1
0
Byte
0
Reserved
SPF
(0)
Page
Code
(1Ch)
1
Additional
Page
Length
(0Ah)
2
Perf
(0)
Reserved
Dexcpt
Test
(0)
Reserved
LogErr
3
Reserved
MRIE
(0)
4
-
7
Internal
Timer
8
-
11
Report
Count
/
Test
Flag
Number
Chapter
3.
Supported
SCSI
Commands
3-23