The
following
table
provides
the
UPS
guidelines
for
the
SAN
Volume
Controller
2145-8F2
and
the
SAN
Volume
Controller
2145-8F4:
Number
of
SAN
Volume
Controller
2145-8F2
or
SAN
Volume
Controller
2145-8F4
models
Number
of
2145
UPS
units
Number
of
2145
UPS-1U
units
2
Not
supported
2
4
Not
supported
4
6
Not
supported
6
8
Not
supported
8
Attention:
1.
Do
not
connect
the
UPSs
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.
The
UPS
is
connected
to
the
SAN
Volume
Controller
nodes
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
Controller
nodes
to
read
status
and
identification
information
from
the
UPS.
UPS
operation
Each
SAN
Volume
Controller
node
monitors
the
operational
state
of
the
uninterruptible
power
supply
(UPS)
to
which
it
is
attached.
If
the
UPS
reports
a
loss
of
input
power,
the
SAN
Volume
Controller
node
stops
all
I/O
operations
and
dumps
the
contents
of
its
dynamic
random
access
memory
(DRAM)
to
the
internal
disk
drive.
When
input
power
to
the
UPS
is
restored,
the
SAN
Volume
Controller
node
restarts
and
restores
the
original
contents
of
the
DRAM
from
the
data
saved
on
the
disk
drive.
A
SAN
Volume
Controller
node
is
not
fully
operational
until
the
UPS
battery
charge
state
indicates
that
it
has
sufficient
capacity
to
power
the
SAN
Volume
Controller
node
long
enough
to
save
all
of
its
memory
to
the
disk
drive.
This
is
in
the
event
of
a
power
loss.
The
UPS
has
sufficient
capacity
to
save
all
the
data
on
the
SAN
Volume
Controller
node
at
least
twice.
For
a
fully-charged
UPS,
even
after
battery
capacity
has
been
used
to
power
the
SAN
Volume
Controller
node
while
it
saves
DRAM
data,
sufficient
battery
capacity
remains
to
allow
the
SAN
Volume
Controller
node
to
become
fully
operational
as
soon
as
input
power
is
restored.
Note:
If
input
power
is
disconnected
from
the
UPS,
a
fully-operational
SAN
Volume
Controller
node
that
is
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
node,
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
output
power
is
removed
five
minutes
after
the
power
is
disconnected
from
the
UPS.
Because
this
operation
is
controlled
by
the
SAN
Chapter
2.
UPS
29
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Summary of Contents for 2145-4F2
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