Dell PowerVault TL4000 SCSI Reference Guide - Page 47

Alert, Element, Address, Assignment

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IALUAE: An implicit asymmetric logical unit access enabled (IALUAE) bit 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 retrieve the tape alerts logging method. Bit 7 Byte 0 PS (0) 1 2 Perf (0) 3 4 - 7 8 - 11 6 5 4 3 2 1 SPF (1) Page Code (0Ah) Additional Page Length (0Ah) Reserved DExcpt (1) Test (0) Reserved Reserved MRIE (0) Interval Timer Report Count / Test Flag Number 0 LogErr Field descriptions: PS: Parameters Savable. This field is set to zero. The media changer cannot write this page to non-volatile memory. Perf: When this bit is set to 0, this indicates that informational exception operations that can cause delays are acceptable. This bit is always set to zero. DExcpt: When this bit is set to zero the reporting method indicated by the MRIE field is used. When this bit is set to one this indicates that the media changer shall disable all information exception operations, ignoring the MRIE field (In this mode the initiator must the Tape Alert log page). Currently only MRIE mode 0 is supported, so this bit is ignored. Test: Test modes are not supported, therefore this field is set to 0. LogErr: When this bit is set to 0, the media changer shall not log any Tape Alert events. When this bit is set to 1, the media changer shall log Tape Alert events. MRIE: This field indicates the method used by the media changer to report informational exception conditions. Currently only mode 0 is supported. This means that Tape Alert flags can only be read by polling with the LOG SENSE command to the Tape Alert page. Interval Timer: The library does not report Tape Alert conditions as Informational Exception conditions, therefore this field is set to zero. Report Count / Test Flag Number: Since test modes are not supported, this field reports Report Count only. But the library does not support Informational Exception conditions, therefore this field is set to zero. Element Address Assignment page (1Dh) The Element Address Assignment Page is used to assign addresses to the elements of the medium changer (via the Mode Select command) and to report those assignments (Mode Sense). This page also defines the number of each type of element present in the subsystem configuration. Chapter 3. Supported SCSI Commands 3-33

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IALUAE:
An
implicit
asymmetric
logical
unit
access
enabled
(IALUAE)
bit
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
retrieve
the
tape
alerts
logging
method.
Bit
7
6
5
4
3
2
1
0
Byte
0
PS
(0)
SPF
(1)
Page
Code
(0Ah)
1
Additional
Page
Length
(0Ah)
2
Perf
(0)
Reserved
DExcpt
(1)
Test
(0)
Reserved
LogErr
3
Reserved
MRIE
(0)
4
-
7
Interval
Timer
8
-
11
Report
Count
/
Test
Flag
Number
Field
descriptions:
PS:
Parameters
Savable.
This
field
is
set
to
zero.
The
media
changer
cannot
write
this
page
to
non-volatile
memory.
Perf:
When
this
bit
is
set
to
0,
this
indicates
that
informational
exception
operations
that
can
cause
delays
are
acceptable.
This
bit
is
always
set
to
zero.
DExcpt:
When
this
bit
is
set
to
zero
the
reporting
method
indicated
by
the
MRIE
field
is
used.
When
this
bit
is
set
to
one
this
indicates
that
the
media
changer
shall
disable
all
information
exception
operations,
ignoring
the
MRIE
field
(In
this
mode
the
initiator
must
the
Tape
Alert
log
page).
Currently
only
MRIE
mode
0
is
supported,
so
this
bit
is
ignored.
Test:
Test
modes
are
not
supported,
therefore
this
field
is
set
to
0.
LogErr:
When
this
bit
is
set
to
0,
the
media
changer
shall
not
log
any
Tape
Alert
events.
When
this
bit
is
set
to
1,
the
media
changer
shall
log
Tape
Alert
events.
MRIE:
This
field
indicates
the
method
used
by
the
media
changer
to
report
informational
exception
conditions.
Currently
only
mode
0
is
supported.
This
means
that
Tape
Alert
flags
can
only
be
read
by
polling
with
the
LOG
SENSE
command
to
the
Tape
Alert
page.
Interval
Timer:
The
library
does
not
report
Tape
Alert
conditions
as
Informational
Exception
conditions,
therefore
this
field
is
set
to
zero.
Report
Count
/
Test
Flag
Number:
Since
test
modes
are
not
supported,
this
field
reports
Report
Count
only.
But
the
library
does
not
support
Informational
Exception
conditions,
therefore
this
field
is
set
to
zero.
Element
Address
Assignment
page
(1Dh)
The
Element
Address
Assignment
Page
is
used
to
assign
addresses
to
the
elements
of
the
medium
changer
(via
the
Mode
Select
command)
and
to
report
those
assignments
(Mode
Sense).
This
page
also
defines
the
number
of
each
type
of
element
present
in
the
subsystem
configuration.
Chapter
3.
Supported
SCSI
Commands
3-33