Dell PowerVault TL4000 SCSI Reference Guide - Page 26

Header, format, Supported, s, Event

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Allocation Length: The Allocation Length field is used to inform the target how much space the initiator has allocated for data. The target returns the bytes specified by allocation length. Log Page Header format Each Log Sense page begins with a 4-byte header. Bit 7 6 5 4 3 2 1 0 Byte 0 Reserved Page Code 1 Reserved 2 - 3 Page Length Field descriptions: Page Code: The Page Code echoes the page code that was specified in the CDB. Page Length: The Page Length specifies the total number of bytes contained in this log page, not including the four bytes of the header. Supported Pages Log Page (00h) When page 0 is requested, the 4-byte page header is returned followed by the pages supported in ascending order, one byte for each page. Bit 7 6 5 4 3 2 1 0 Byte 0 Reserved Page Code (00h) 1 Reserved 2 - 3 Page Length (5) 4 00h - Supported Log Pages page 5 07h - Event Log page 6 2Eh - Tape Alert page 7 30h - Statistics Counter page 8 33h - Error Log page Event Log Page (07h) In the Event Log the media changer keeps track of different system events. These events exist out of hardware errors, executed commands, and debug information. The events are stored in a FIFO mode, this means that only the n most recent events are stored. Older events are deleted. This log is stored in non volatile memory (NVRAM) and is therefore resistant to power failures. The data returned for the Event log page shall not exceed 64KBytes. A single LOG SENSE command to the Event Log page may return all events. The Event Log page starts with a header indicating the number of bytes of the total event history, followed by zero or more event structures. Reading the Event Log page shall not clear the event data. Clearing the event data is done by means of the LOG SELECT command. Note: The Host may specify what event types need to be logged. This is done with the MODE SELECT command to the vendor specific Event Filter page. 3-12 TL2000 and TL4000 SCSI Reference

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Allocation
Length:
The
Allocation
Length
field
is
used
to
inform
the
target
how
much
space
the
initiator
has
allocated
for
data.
The
target
returns
the
bytes
specified
by
allocation
length.
Log
Page
Header
format
Each
Log
Sense
page
begins
with
a
4-byte
header.
Bit
7
6
5
4
3
2
1
0
Byte
0
Reserved
Page
Code
1
Reserved
2
-
3
Page
Length
Field
descriptions:
Page
Code:
The
Page
Code
echoes
the
page
code
that
was
specified
in
the
CDB.
Page
Length:
The
Page
Length
specifies
the
total
number
of
bytes
contained
in
this
log
page,
not
including
the
four
bytes
of
the
header.
Supported
Pages
Log
Page
(00h)
When
page
0
is
requested,
the
4-byte
page
header
is
returned
followed
by
the
pages
supported
in
ascending
order,
one
byte
for
each
page.
Bit
7
6
5
4
3
2
1
0
Byte
0
Reserved
Page
Code
(00h)
1
Reserved
2
-
3
Page
Length
(5)
4
00h
-
Supported
Log
Pages
page
5
07h
-
Event
Log
page
6
2Eh
-
Tape
Alert
page
7
30h
-
Statistics
Counter
page
8
33h
-
Error
Log
page
Event
Log
Page
(07h)
In
the
Event
Log
the
media
changer
keeps
track
of
different
system
events.
These
events
exist
out
of
hardware
errors,
executed
commands,
and
debug
information.
The
events
are
stored
in
a
FIFO
mode,
this
means
that
only
the
n
most
recent
events
are
stored.
Older
events
are
deleted.
This
log
is
stored
in
non
volatile
memory
(NVRAM)
and
is
therefore
resistant
to
power
failures.
The
data
returned
for
the
Event
log
page
shall
not
exceed
64KBytes.
A
single
LOG
SENSE
command
to
the
Event
Log
page
may
return
all
events.
The
Event
Log
page
starts
with
a
header
indicating
the
number
of
bytes
of
the
total
event
history,
followed
by
zero
or
more
event
structures.
Reading
the
Event
Log
page
shall
not
clear
the
event
data.
Clearing
the
event
data
is
done
by
means
of
the
LOG
SELECT
command.
Note:
The
Host
may
specify
what
event
types
need
to
be
logged.
This
is
done
with
the
MODE
SELECT
command
to
the
vendor
specific
Event
Filter
page.
3-12
TL2000
and
TL4000
SCSI
Reference