application
failures.
It
can
also
be
used
to
balance
server
workload
and
provide
for
planned
maintenance.
mini
hub.
An
interface
card
or
port
device
that
receives
short-wave
fiber
channel
GBICs
or
SFPs.
These
devices
enable
redundant
fibre
channel
connections
from
the
host
computers,
either
directly
or
through
a
fibre
channel
switch
or
managed
hub,
over
optical
fiber
cables
to
the
DS4000
Storage
Server
controllers.
Each
DS4000
controller
is
responsible
for
two
mini
hubs.
Each
mini
hub
has
two
ports.
Four
host
ports
(two
on
each
controller)
provide
a
cluster
solution
without
use
of
a
switch.
Two
host-side
mini
hubs
are
shipped
as
standard.
See
also
host
port,
gigabit
interface
converter
(GBIC),
small
form-factor
pluggable
(SFP)
.
mirroring.
A
fault-tolerance
technique
in
which
information
on
a
hard
disk
is
duplicated
on
additional
hard
disks.
See
also
remote
mirroring
.
model.
The
model
identification
that
is
assigned
to
a
device
by
its
manufacturer.
MSCS.
See
Microsoft
Cluster
Server
.
network
management
station
(NMS).
In
the
Simple
Network
Management
Protocol
(SNMP),
a
station
that
runs
management
application
programs
that
monitor
and
control
network
elements.
NMI.
See
non-maskable
interrupt
.
NMS.
See
network
management
station
.
non-maskable
interrupt
(NMI).
A
hardware
interrupt
that
another
service
request
cannot
overrule
(mask).
An
NMI
bypasses
and
takes
priority
over
interrupt
requests
generated
by
software,
the
keyboard,
and
other
such
devices
and
is
issued
to
the
microprocessor
only
in
disastrous
circumstances,
such
as
severe
memory
errors
or
impending
power
failures.
node.
A
physical
device
that
allows
for
the
transmission
of
data
within
a
network.
node
port
(N_port).
A
fibre-channel
defined
hardware
entity
that
performs
data
communications
over
the
fibre-channel
link.
It
is
identifiable
by
a
unique
worldwide
name.
It
can
act
as
an
originator
or
a
responder.
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
150
IBM
TotalStorage
DS4000
EXP100
Storage
Expansion
Enclosure:
Installation,
User’s
and
Maintenance
Guide
Summary of Contents for TotalStorage EXP100
Page 2: ......
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