worldwide
port
name
(WWPN)
A
unique
64-bit
identifier
associated
with
a
fibre-channel
adapter
port.
It
is
assigned
in
an
implementation-
and
protocol-independent
manner.
See
also
worldwide
node
name
write
hit
A
write
operation
in
which
the
requested
data
is
in
the
cache.
write
penalty
The
performance
impact
of
a
classical
RAID-5
write
operation.
WWNN
See
worldwide
node
name
.
WWPN
See
worldwide
port
name
.
X
xSeries
The
product
name
of
an
IBM
e(logo)server
product
that
emphasizes
industry-standard
server
scalability
and
self-managing
server
technologies.
It
is
the
successor
to
the
Netfinity
family
of
servers.
Z
z/Architecture
An
IBM
architecture
for
mainframe
computers
and
peripherals.
The
IBM
e(logo)server
zSeries
family
of
servers
uses
the
z/Architecture
architecture.
It
is
the
successor
to
the
S/390
and
9672
family
of
servers.
See
also
iSeries
.
z/OS
An
operating
system
for
the
IBM
e(logo)server
product
line
that
supports
64-bit
real
storage.
z/OS
Global
Mirror
A
function
of
a
storage
server
that
assists
a
control
program
to
maintain
a
consistent
copy
of
a
logical
volume
on
another
storage
unit.
All
modifications
of
the
primary
logical
volume
by
any
attached
host
are
presented
in
order
to
a
single
host.
The
host
then
makes
these
modifications
on
the
secondary
logical
volume.
This
function
was
formerly
called
extended
remote
copy
or
XRC.
zSeries
An
IBM
e(logo)server
family
of
servers
that
emphasizes
near-zero
downtime.
IBM
enterprise
servers
based
on
z/Architecture.
zSeries
storage
Storage
arrays
and
logical
volumes
that
are
defined
in
the
DS6000
as
connected
to
zSeries
servers.
254
DS6000
Host
Systems
Attachment
Guide
Summary of Contents for System storage DS6000 Series
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