Dell PowerVault TL4000 SCSI Reference Guide - Page 63

Prevent, Allow, Media, Removal

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PREVENT / ALLOW MEDIA REMOVAL (1Eh) The PREVENT / ALLOW MEDIA REMOVAL commands enable or disable removing cartridges from the media changer. A prevent condition inhibits the media changer to remove magazines and open the Import/Export element. A prevent condition of the media changer shall not affect an UNLOAD command issued to the tape drive. Also a prevent condition shall not inhibit a front panel LOAD of a cartridge when the tape drive is empty. A prevent condition is cleared when all initiators issue the Prevent Allow Medium Removal command with the Prevent field set to 0 (allow cartridge removal). The prevent condition is also cleared after a power on and after a SCSI Bus reset. Bit 7 Byte 0 1 2 3 4 5 6 LUN 5 4 3 2 1 Operation Code (1Eh) Reserved Reserved Reserved Control Reserved 0 Prevent Field descriptions: Prevent: When this bit is set, opening of the Import/Export element and unlocking of the magazine functions are disabled. When the Prevent bit is cleared opening of the Import/Export element and the unlocking of the magazine functions are enabled. Chapter 3. Supported SCSI Commands 3-49

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PREVENT
/
ALLOW
MEDIA
REMOVAL
(1Eh)
The
PREVENT
/
ALLOW
MEDIA
REMOVAL
commands
enable
or
disable
removing
cartridges
from
the
media
changer.
A
prevent
condition
inhibits
the
media
changer
to
remove
magazines
and
open
the
Import/Export
element.
A
prevent
condition
of
the
media
changer
shall
not
affect
an
UNLOAD
command
issued
to
the
tape
drive.
Also
a
prevent
condition
shall
not
inhibit
a
front
panel
LOAD
of
a
cartridge
when
the
tape
drive
is
empty.
A
prevent
condition
is
cleared
when
all
initiators
issue
the
Prevent
Allow
Medium
Removal
command
with
the
Prevent
field
set
to
0
(allow
cartridge
removal).
The
prevent
condition
is
also
cleared
after
a
power
on
and
after
a
SCSI
Bus
reset.
Bit
7
6
5
4
3
2
1
0
Byte
0
Operation
Code
(1Eh)
1
LUN
Reserved
2
Reserved
3
Reserved
4
Reserved
Prevent
5
Control
Field
descriptions:
Prevent:
When
this
bit
is
set,
opening
of
the
Import/Export
element
and
unlocking
of
the
magazine
functions
are
disabled.
When
the
Prevent
bit
is
cleared
opening
of
the
Import/Export
element
and
the
unlocking
of
the
magazine
functions
are
enabled.
Chapter
3.
Supported
SCSI
Commands
3-49