Each
uninterruptible
power
supply
includes
power
(line)
cords
that
will
connect
the
uninterruptible
power
supply
to
either
a
rack
power
distribution
unit
(PDU),
if
one
exists,
or
to
an
external
power
source.
Each
uninterruptible
power
supply
power
input
requires
the
protection
of
a
UL
approved
(or
equivalent)
250
volt,
15
amp
circuit
breaker.
The
uninterruptible
power
supply
is
connected
to
the
SAN
Volume
Controllers
with
a
power
cable
and
a
signal
cable.
To
avoid
the
possibility
of
power
and
signal
cables
being
connected
to
different
uninterruptible
power
supply
units,
these
cables
are
wrapped
together
and
supplied
as
a
single
field
replaceable
unit.
The
signal
cables
enable
the
SAN
Volume
Controllers
to
read
status
and
identification
information
from
the
uninterruptible
power
supply.
Each
SAN
Volume
Controller
monitors
the
operational
state
of
the
uninterruptible
power
supply
to
which
it
is
attached.
If
the
uninterruptible
power
supply
reports
a
loss
of
input
power,
the
SAN
Volume
Controller
stops
all
I/O
operations
and
dumps
the
contents
of
its
DRAM
to
the
internal
disk
drive.
When
input
power
to
the
uninterruptible
power
supply
is
restored,
the
SAN
Volume
Controllers
restart
and
restore
the
original
contents
of
the
DRAM
from
the
data
saved
on
the
disk
drive.
A
SAN
Volume
Controller
is
not
fully
operational
until
the
uninterruptible
power
supply
battery
charge
state
indicates
that
it
has
sufficient
capacity
to
power
the
SAN
Volume
Controller
for
long
enough
to
permit
it
to
save
all
its
memory
to
the
disk
drive
in
the
event
of
a
power
loss.
The
uninterruptible
power
supply
has
sufficient
capacity
to
save
all
the
data
on
the
SAN
Volume
Controller
at
least
twice.
For
a
fully-charged
uninterruptible
power
supply,
even
after
battery
capacity
has
been
used
to
power
the
SAN
Volume
Controllers
while
they
save
DRAM
data,
sufficient
battery
capacity
will
remain
to
let
the
SAN
Volume
Controllers
become
fully
operational
as
soon
as
input
power
is
restored.
Note:
Under
normal
circumstances,
if
input
power
is
disconnected
from
the
uninterruptible
power
supply,
the
SAN
Volume
Controller(s)
connected
to
that
uninterruptible
power
supply
will
perform
a
power
down
sequence.
This
operation,
which
saves
the
configuration
and
cache
data
to
an
internal
disk
in
the
SAN
Volume
Controller,
typically
takes
about
3
minutes,
at
which
time
power
is
removed
from
the
output
of
the
uninterruptible
power
supply.
In
the
event
of
a
delay
in
the
completion
of
the
power
down
sequence,
the
uninterruptible
power
supply
output
power
will
be
removed
5
minutes
after
the
time
that
power
was
disconnected
to
the
uninterruptible
power
supply.
Since
this
operation
is
controlled
by
the
SAN
Volume
Controller,
an
uninterruptible
power
supply
that
is
not
connected
to
an
active
SAN
Volume
Controller
will
not
shut
off
within
the
5
minute
required
period.
In
the
case
of
an
emergency,
you
will
need
to
manually
shut
down
the
uninterruptible
power
supply
by
pushing
the
uninterruptible
power
supply
power
off
button.
Attention:
Data
integrity
could
be
compromised
by
pushing
the
uninterruptible
power
supply
power
off
button.
Never
shut
down
an
uninterruptible
power
supply
without
first
shutting
down
the
SAN
Volume
Controller
nodes
that
it
supports.
It
is
very
important
that
the
two
nodes
in
the
I/O
group
are
connected
to
a
different
uninterruptible
power
supply.
This
configuration
ensures
that
the
cache
and
cluster
state
information
is
protected
against
the
failure
of
the
uninterruptible
power
supply
or
of
the
mainline
power
source.
8
Installation
Guide
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Summary of Contents for TotalStorage
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