recommended
that
you
connect
the
two
UPS
units
for
the
pair
to
different
independent
electrical
power
sources.
This
reduces
the
chance
of
an
input
power
failure
at
both
UPS
units.
The
UPS
must
be
in
the
same
rack
as
the
nodes.
Ensure
that
you
are
following
the
UPS
guidelines
that
are
provided
in
Table
1.
Uninterruptible
power
supply
support
guidelines
Number
of
nodes
Number
of
uninterruptible
power
supply
5125
units
Number
of
uninterruptible
power
supply
5115
units
2
2
2
4
2
4
6
4
6
8
4
8
Attention:
1.
Do
not
connect
the
uninterruptible
power
supplies
to
an
input
power
source
that
does
not
conform
to
standards.
2.
Each
UPS
pair
must
power
only
one
SAN
Volume
Controller
cluster.
Each
UPS
includes
power
(line)
cords
that
connect
the
UPS
to
either
a
rack
power
distribution
unit
(PDU),
if
one
exists,
or
to
an
external
power
source.
Each
UPS
power
input
requires
the
protection
of
a
UL-approved
(or
equivalent)
250
volt,
15
amp
circuit
breaker.
The
UPS
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
UPS
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
UPS.
Each
SAN
Volume
Controller
monitors
the
operational
state
of
the
UPS
to
which
it
is
attached.
If
the
UPS
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
UPS
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
UPS
battery
charge
state
indicates
that
it
has
sufficient
capacity
to
power
the
SAN
Volume
Controller
long
enough
to
permit
it
to
save
all
its
memory
to
the
disk
drive
in
the
event
of
a
power
loss.
The
UPS
has
sufficient
capacity
to
save
all
the
data
on
the
SAN
Volume
Controller
at
least
twice.
For
a
fully-charged
UPS,
even
after
battery
capacity
has
been
used
to
power
the
SAN
Volume
Controllers
while
they
save
DRAM
data,
sufficient
battery
capacity
remains
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
UPS,
the
SAN
Volume
Controller
connected
to
that
UPS
performs
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
three
minutes,
at
which
time
power
is
removed
from
the
output
of
the
UPS.
In
the
event
of
a
delay
in
the
completion
of
the
power
down
sequence,
the
UPS
Chapter
2.
Overview
of
the
uninterruptible
power
supply
17
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Содержание TotalStorage SAN Volume Controller
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