operating
set
In
SAN
Volume
Controller,
the
set
of
nodes
that
are
operating
together
to
deliver
storage
services.
oversubscription
The
ratio
of
the
sum
of
the
traffic
that
is
on
the
initiator
N-node
connections
to
the
traffic
that
is
on
the
most
heavily
loaded
interswitch
links
(ISLs),
where
more
than
one
ISL
is
connected
in
parallel
between
these
switches.
This
definition
assumes
a
symmetrical
network
and
a
specific
workload
that
is
applied
equally
from
all
initiators
and
sent
equally
to
all
targets.
See
also
symmetrical
network
.
P
partition
IBM
definition:
A
logical
division
of
storage
on
a
fixed
disk.
HP
definition:
A
logical
division
of
a
container
represented
to
the
host
as
a
logical
unit.
partner
node
The
other
node
that
is
in
the
I/O
group
to
which
this
node
belongs.
partnership
In
Metro
or
Global
Mirror
operations,
the
relationship
between
two
clusters.
In
a
cluster
partnership,
one
cluster
is
defined
as
the
local
cluster
and
the
other
cluster
as
the
remote
cluster.
paused
In
SAN
Volume
Controller,
the
process
by
which
the
cache
component
quiesces
all
ongoing
I/O
activity
below
the
cache
layer.
pend
To
cause
to
wait
for
an
event.
petabyte
(PB)
In
decimal
notation,
1
125
899
906
842
624
bytes.
PDU
See
power
distribution
unit
.
PLUN
See
managed
disk
.
point-in-time
copy
The
instantaneous
copy
that
the
FlashCopy
service
makes
of
the
source
virtual
disk
(VDisk).
In
some
contexts,
this
copy
is
known
as
a
T
0
copy
.
port
The
physical
entity
within
a
host,
SAN
Volume
Controller,
or
disk
controller
system
that
performs
the
data
communication
(transmitting
and
receiving)
over
the
fibre
channel.
port
ID
An
identifier
associated
with
a
port.
power
distribution
unit
(PDU)
A
device
that
distributes
electrical
power
to
multiple
devices
in
the
rack.
It
typically
is
rack-mounted
and
provides
circuit
breakers
and
transient
voltage
suppression.
power-on
self-test
A
diagnostic
test
that
servers
or
computers
run
when
they
are
turned
on.
prepared
In
a
Global
Mirror
relationship,
the
state
that
occurs
when
the
mapping
is
ready
to
start.
While
in
this
state,
the
target
virtual
disk
(VDisk)
is
offline.
176
IBM
System
Storage
SAN
Volume
Controller:
Hardware
Installation
Guide
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