At
the
front
of
a
2104
Model
DS4,
there
are
14
device
slots
1
.
Each
slot
must
contain
either
a
SCSI
disk
drive
module
or
a
dummy
disk
module.
Each
disk
drive
module
connects
to
a
backplane,
which
is
mounted
vertically
about
halfway
between
the
front
and
back
of
the
2104
Model
DS4.
Note:
To
run
input/output
(I/O),
a
minimum
of
one
SCSI
disk
drive
module
must
be
present
in
each
2104
Model
DS4.
The
14
device
slots
are
divided
into
two
groups
of
7
slots.
Between
the
two
groups
of
7
slots,
there
is
a
SCSI
bridge
card
2
.
The
SCSI
bridge
card
assigns
the
disk
drive
modules
to
a
SCSI
bus,
in
accordance
with
the
setting
of
the
SCSI
bus
split
switch.
On
the
back
of
the
backplane
are
connectors
for
two
fan-and-power-supply
assemblies
4
and
two
SCSI
Interface
cards
3
.
The
2104
Model
DS4
has
either
two
fan-and-power-supply
assemblies,
or
one
fan-and-power-supply
assembly
and
one
fan
assembly.
Either
option
provides
all
the
necessary
power
and
cooling
for
the
2104
Model
DS4.
Having
two
fan-and-power-supply
assemblies
is
better
than
one
fan-and-power-supply
assembly
and
one
fan
assembly
because
the
amount
of
power
required
from
each
power
supply
is
reduced.
If
one
power
supply
fails,
power
for
the
2104
disk
enclosure
continues
to
be
supplied
by
the
other
power
supply.
The
SCSI
Interface
cards
3
connect
the
host
machines
to
the
2104
Model
DS4.
These
cards
contain
logic
that
provides
information
about
what
is
happening
in
the
2104
Model
DS4
and
the
status
of
components
within
it.
The
SCSI
Interface
cards
3
contain
switches
that
control:
The
SCSI
Interface
cards
also
contain
a
rotary
switch
that
sets
the
ID
of
the
2104
Model
DS4.
v
Which
SCSI
bus
mode
is
selected
v
How
the
2104
Model
DS4
is
supplied
with
power
v
What
enclosure
services
are
enabled
For
more
options
about
how
to
configure
a
2104
Model
DS4,
see
the
Expandable
Storage
Plus:
2104
Model
DS4
Installation
Guide
.
Chapter
1.
Using
the
2104
Model
DS4
or
Model
TS4
3
Содержание Bull Escala 2104 DS4
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