Dell PowerVault TL4000 SCSI Reference Guide - Page 86

Diagnostic

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SEND DIAGNOSTIC (1Dh) By means of this command the media changer can be requested to perform a self-test operation on itself. During this self-test the serial communication to the tape drive and robotics is tested. Also any pending Hardware Error condition is reported on this command. Byte 0 1 2 3 4 5 Bit 7 (MSB) 6 LUN 5 4 3 2 1 0 Operation Code (1Dh) PF (1) Reserved SelfT (1) Reserved Parameter List Length (0) Control DOfl (0) UOfl (0) (LSB) Field descriptions: PF: Page Format. The value for this bit must be set to 1 to indicate that the SEND DIAGNOSTICS parameters conform to the page structure as specified in SCSI-2. SelfT: This bit indicates whether the media changer should perform the diagnostic test specified in the parameter list or a standard self-test. The library only supports the self-test and should therefore be set to 1. DOfl: Device Offline. Since diagnostics tests must be performed when the media changer is online, the value of this bit must be set to 0. UOfl: Unit Offline. Since the media changer is a single logical unit, the value of this bit must be set to 0. Parameter List Length: The media changer does not accept additional parameters for diagnostics test. Must be set to zero. 3-72 TL2000 and TL4000 SCSI Reference

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SEND
DIAGNOSTIC
(1Dh)
By
means
of
this
command
the
media
changer
can
be
requested
to
perform
a
self-test
operation
on
itself.
During
this
self-test
the
serial
communication
to
the
tape
drive
and
robotics
is
tested.
Also
any
pending
Hardware
Error
condition
is
reported
on
this
command.
Bit
7
6
5
4
3
2
1
0
Byte
0
Operation
Code
(1Dh)
1
LUN
PF
(1)
Reserved
SelfT
(1)
DOfl
(0)
UOfl
(0)
2
Reserved
3
(MSB)
Parameter
List
Length
(0)
4
(LSB)
5
Control
Field
descriptions:
PF:
Page
Format.
The
value
for
this
bit
must
be
set
to
1
to
indicate
that
the
SEND
DIAGNOSTICS
parameters
conform
to
the
page
structure
as
specified
in
SCSI-2.
SelfT:
This
bit
indicates
whether
the
media
changer
should
perform
the
diagnostic
test
specified
in
the
parameter
list
or
a
standard
self-test.
The
library
only
supports
the
self-test
and
should
therefore
be
set
to
1.
DOfl:
Device
Offline.
Since
diagnostics
tests
must
be
performed
when
the
media
changer
is
online,
the
value
of
this
bit
must
be
set
to
0.
UOfl:
Unit
Offline.
Since
the
media
changer
is
a
single
logical
unit,
the
value
of
this
bit
must
be
set
to
0.
Parameter
List
Length:
The
media
changer
does
not
accept
additional
parameters
for
diagnostics
test.
Must
be
set
to
zero.
3-72
TL2000
and
TL4000
SCSI
Reference