Dell PowerVault TL4000 SCSI Reference Guide - Page 97

initialization

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TEST UNIT READY (00h) TEST UNIT READY checks if the media changer is ready for commands involving cartridge movement. If the media changer has completed initialization and the magazines are inserted, the command returns Good Status. Otherwise, Check Condition is reported. Due to power cycle, code update, etc., it is possible to get multiple check conditions on TEST UNIT READY commands. Bit 7 6 5 4 3 2 1 0 Byte 0 Operation Code (00h) 1 LUN Reserved 2 Reserved 3 Reserved 4 Reserved 5 Control Field descriptions: Chapter 3. Supported SCSI Commands 3-83

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TEST
UNIT
READY
(00h)
TEST
UNIT
READY
checks
if
the
media
changer
is
ready
for
commands
involving
cartridge
movement.
If
the
media
changer
has
completed
initialization
and
the
magazines
are
inserted,
the
command
returns
Good
Status.
Otherwise,
Check
Condition
is
reported.
Due
to
power
cycle,
code
update,
etc.,
it
is
possible
to
get
multiple
check
conditions
on
TEST
UNIT
READY
commands.
Bit
7
6
5
4
3
2
1
0
Byte
0
Operation
Code
(00h)
1
LUN
Reserved
2
Reserved
3
Reserved
4
Reserved
5
Control
Field
descriptions:
Chapter
3.
Supported
SCSI
Commands
3-83