acknowledgment
of
a
write
operation
from
the
secondary
controller
before
returning
a
write
I/O
request
completion
to
the
host.
See
also
asynchronous
write
mode
,
remote
mirroring
,
Metro
Mirroring
.
system
name.
Device
name
assigned
by
the
vendor’s
third-party
software.
TCP.
See
Transmission
Control
Protocol
.
TCP/IP.
See
Transmission
Control
Protocol/Internet
Protocol
.
terminate
and
stay
resident
program
(TSR
program).
A
program
that
installs
part
of
itself
as
an
extension
of
DOS
when
it
is
executed.
topology.
The
physical
or
logical
arrangement
of
devices
on
a
network.
The
three
fibre-channel
topologies
are
fabric,
arbitrated
loop,
and
point-to-point.
The
default
topology
for
the
disk
array
is
arbitrated
loop.
TL_port.
See
translated
loop
port
.
transceiver.
A
device
that
is
used
to
transmit
and
receive
data.
Transceiver
is
an
abbreviation
of
transmitter-receiver.
translated
loop
port
(TL_port).
A
port
that
connects
to
a
private
loop
and
allows
connectivity
between
the
private
loop
devices
and
off
loop
devices
(devices
not
connected
to
that
particular
TL_port).
Transmission
Control
Protocol
(TCP).
A
communication
protocol
used
in
the
Internet
and
in
any
network
that
follows
the
Internet
Engineering
Task
Force
(IETF)
standards
for
internetwork
protocol.
TCP
provides
a
reliable
host-to-host
protocol
between
hosts
in
packed-switched
communication
networks
and
in
interconnected
systems
of
such
networks.
It
uses
the
Internet
Protocol
(IP)
as
the
underlying
protocol.
Transmission
Control
Protocol/Internet
Protocol
(TCP/IP).
A
set
of
communication
protocols
that
provide
peer-to-peer
connectivity
functions
for
both
local
and
wide-area
networks.
trap.
In
the
Simple
Network
Management
Protocol
(SNMP),
a
message
sent
by
a
managed
node
(agent
function)
to
a
management
station
to
report
an
exception
condition.
trap
recipient.
Receiver
of
a
forwarded
Simple
Network
Management
Protocol
(SNMP)
trap.
Specifically,
a
trap
receiver
is
defined
by
an
Internet
Protocol
(IP)
address
and
port
to
which
traps
are
sent.
Presumably,
the
actual
recipient
is
a
software
application
running
at
the
IP
address
and
listening
to
the
port.
TSR
program.
See
terminate
and
stay
resident
program
.
uninterruptible
power
supply.
A
source
of
power
from
a
battery
that
is
installed
between
a
computer
system
and
its
power
source.
The
uninterruptible
power
supply
keeps
the
system
running
if
a
commercial
power
failure
occurs,
until
an
orderly
shutdown
of
the
system
can
be
performed.
user
action
events.
Actions
that
the
user
takes,
such
as
changes
in
the
storage
area
network
(SAN),
changed
settings,
and
so
on.
worldwide
port
name
(WWPN).
A
unique
identifier
for
a
switch
on
local
and
global
networks.
worldwide
name
(WWN).
A
globally
unique
64-bit
identifier
assigned
to
each
Fibre
Channel
port.
WORM.
See
write-once
read-many
.
write-once
read
many
(WORM).
Any
type
of
storage
medium
to
which
data
can
be
written
only
a
single
time,
but
can
be
read
from
any
number
of
times.
After
the
data
is
recorded,
it
cannot
be
altered.
WWN.
See
worldwide
name
.
zoning.
(1)
In
Fibre
Channel
environments,
the
grouping
of
multiple
ports
to
form
a
virtual,
private,
storage
network.
Ports
that
are
members
of
a
zone
can
communicate
with
each
other,
but
are
isolated
from
ports
in
other
zones.
(2)
A
function
that
allows
segmentation
of
nodes
by
address,
name,
or
physical
port
and
is
provided
by
fabric
switches
or
hubs.
Glossary
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