When
3590
B1A,
E1A,
or
H1A
tape
drives
are
attached
to
the
3494
Tape
Library,
the
following
functions
change:
Drive
control
The
Library
Manager
controls
the
loading
and
the
unloading
of
volumes.
The
3590
B1A,
E1A,
or
H1A
tape
drive
communicates
with
the
Library
Manager
to
update
the
database
with
drive
status
and
cartridge
location
information.
Message
displays
The
Library
Manager
controls
the
display
of
messages
to
prevent
the
messages
from
getting
out
of
synchronization
with
the
Library
Manager
during
Manual
mode
operations.
Attention
interrupt
The
Library
Manager
can
use
the
communication
path
to
the
3590
A00,
A50,
or
A60
Controller
to
send
information
to
the
host.
For
more
information
on
3590
controls
and
indicators,
see
the
IBM
TotalStorage
Enterprise
Tape
System
3590
Operator
Guide
.
3490E
C1A,
C2A
Tape
Drive
Controls
The
3490E
Model
CxA
control
unit
and
drive
unit
operator
panels
(
1
and
2
respectively
in
are
accessible
by
opening
the
front
door
of
the
frame
that
contains
the
tape
subsystem.
When
3490E
subsystems
are
attached
to
the
3494
Tape
Library,
the
following
3490E
functions
change:
Drive
control
The
Library
Manager
controls
the
loading
and
the
unloading
of
volumes.
The
3490E
tape
subsystem
communicates
with
the
Library
Manager
to
update
the
database
with
drive
status
and
cartridge
location
information.
Figure
39.
3590
B1A,
E1A,
or
H1A
tape
drive
-
Operator
Panel
Chapter
2.
Controls
and
Indicators
55
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