nonvolatile
storage
(NVS).
A
storage
device
whose
contents
are
not
lost
when
power
is
cut
off.
N_port.
See
node
port
.
NVS.
See
nonvolatile
storage
.
NVSRAM.
Nonvolatile
storage
random
access
memory.
See
nonvolatile
storage
.
Object
Data
Manager
(ODM).
An
AIX
proprietary
storage
mechanism
for
ASCII
stanza
files
that
are
edited
as
part
of
configuring
a
drive
into
the
kernel.
ODM.
See
Object
Data
Manager
.
out-of-band.
Transmission
of
management
protocols
outside
of
the
fibre-channel
network,
typically
over
Ethernet.
partitioning.
See
storage
partition
.
parity
check.
(1)
A
test
to
determine
whether
the
number
of
ones
(or
zeros)
in
an
array
of
binary
digits
is
odd
or
even.
(2)
A
mathematical
operation
on
the
numerical
representation
of
the
information
communicated
between
two
pieces.
For
example,
if
parity
is
odd,
any
character
represented
by
an
even
number
has
a
bit
added
to
it,
making
it
odd,
and
an
information
receiver
checks
that
each
unit
of
information
has
an
odd
value.
PCI
local
bus.
See
peripheral
component
interconnect
local
bus
.
PDF.
See
portable
document
format
.
performance
events.
Events
related
to
thresholds
set
on
storage
area
network
(SAN)
performance.
peripheral
component
interconnect
local
bus
(PCI
local
bus).
A
local
bus
for
PCs,
from
Intel,
that
provides
a
high-speed
data
path
between
the
CPU
and
up
to
10
peripherals
(video,
disk,
network,
and
so
on).
The
PCI
bus
coexists
in
the
PC
with
the
Industry
Standard
Architecture
(ISA)
or
Extended
Industry
Standard
Architecture
(EISA)
bus.
ISA
and
EISA
boards
plug
into
an
IA
or
EISA
slot,
while
high-speed
PCI
controllers
plug
into
a
PCI
slot.
See
also
Industry
Standard
Architecture
,
Extended
Industry
Standard
Architecture
.
polling
delay.
The
time
in
seconds
between
successive
discovery
processes
during
which
discovery
is
inactive.
port.
A
part
of
the
system
unit
or
remote
controller
to
which
cables
for
external
devices
(such
as
display
stations,
terminals,
printers,
switches,
or
external
storage
units)
are
attached.
The
port
is
an
access
point
for
data
entry
or
exit.
A
device
can
contain
one
or
more
ports.
portable
document
format
(PDF).
A
standard
specified
by
Adobe
Systems,
Incorporated,
for
the
electronic
distribution
of
documents.
files
are
compact;
can
be
distributed
globally
by
e-mail,
the
Web,
intranets,
or
CD-ROM;
and
can
be
viewed
with
the
Acrobat
Reader,
which
is
software
from
Adobe
Systems
that
can
be
downloaded
at
no
cost
from
the
Adobe
Systems
home
page.
premium
feature
key.
A
file
that
the
storage
subsystem
controller
uses
to
enable
an
authorized
premium
feature.
The
file
contains
the
feature
enable
identifier
of
the
storage
subsystem
for
which
the
premium
feature
is
authorized,
and
data
about
the
premium
feature.
See
also
feature
enable
identifier
.
private
loop.
A
freestanding
arbitrated
loop
with
no
fabric
attachment.
See
also
arbitrated
loop
.
program
temporary
fix
(PTF).
A
temporary
solution
or
bypass
of
a
problem
diagnosed
by
IBM
in
a
current
unaltered
release
of
the
program.
PTF.
See
program
temporary
fix
.
RAID.
See
redundant
array
of
independent
disks
(RAID)
.
RAID
level.
An
array’s
RAID
level
is
a
number
that
refers
to
the
method
used
to
achieve
redundancy
and
fault
tolerance
in
the
array.
See
also
array,
redundant
array
of
independent
disks
(RAID)
.
RAID
set.
See
array
.
RAM.
See
random-access
memory
.
random-access
memory
(RAM).
A
temporary
storage
location
in
which
the
central
processing
unit
(CPU)
stores
and
executes
its
processes.
Contrast
with
DASD
.
RDAC.
See
redundant
disk
array
controller
.
read-only
memory
(ROM).
Memory
in
which
stored
data
cannot
be
changed
by
the
user
except
under
special
conditions.
recoverable
virtual
shared
disk
(RVSD).
A
virtual
shared
disk
on
a
server
node
configured
to
provide
continuous
access
to
data
and
file
systems
in
a
cluster.
redundant
array
of
independent
disks
(RAID).
A
collection
of
disk
drives
(
array
)
that
appears
as
a
single
volume
to
the
server,
which
is
fault
tolerant
through
an
assigned
method
of
data
striping,
mirroring,
or
parity
checking.
Each
array
is
assigned
a
RAID
level,
which
is
a
specific
number
that
refers
to
the
method
used
to
achieve
redundancy
and
fault
tolerance.
See
also
array,
parity
check,
mirroring,
RAID
level,
striping
.
redundant
disk
array
controller
(RDAC).
(1)
In
hardware,
a
redundant
set
of
controllers
(either
active/passive
or
active/active).
(2)
In
software,
a
layer
that
manages
the
input/output
(I/O)
through
the
active
Glossary
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