Figure
5
shows
the
components
at
the
back
of
the
DS4100
single-controller
storage
server.
The
DS4100
single-controller
storage
server
has
a
controller
blank
instead
of
a
second
RAID
controller
and
a
power
supply
blank
instead
of
a
second
power
supply.
RAID
controller
Each
RAID
controller
contains
three
ports
for
Small
Form-Factor
Pluggable
(SFP)
modules
that
connect
to
the
fibre
channel
cables.
Two
of
the
SFP
ports
(labelled
Host
1
and
Host
2
)
are
for
host
server
attachment.
The
third
SFP
port
(labelled
Expansion
)
is
used
to
connect
additional
expansion
units
to
the
storage
server.
Note:
In
the
DS4100
single-controller
storage
server,
the
third
SFP
port
(labelled
Expansion
)
is
present
but
not
active.
Each
RAID
controller
also
contains
a
battery
to
maintain
cache
data
in
the
event
of
a
power
failure.
For
more
information,
see
“Cache
memory
and
RAID
controller
battery”
on
page
75.
Attention:
You
will
lose
access
to
data
if
you
attempt
to
hot-swap
the
RAID
controller
in
a
DS4100
single-controller
storage
server.
Hot-swap
fans
The
storage
server
has
two
interchangeable
hot-swap
and
redundant
fan
CRUs.
Each
fan
CRU
contains
two
fans.
If
one
fan
CRU
fails,
the
second
Hot-swap fan bays
Hot-swap
power supplies
Raid controllers
f10ug021
Figure
4.
Back
view
of
DS4100
base
storage
server
Hot-swap fan bays
Power supply
RAID controller
f10ug021b
Figure
5.
Back
view
of
DS4100
single-controller
storage
server
10
IBM
TotalStorage
DS4100
Storage
Server:
Installation,
User’s,
and
Maintenance
Guide
Summary of Contents for TotalStorage DS4100
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