The
configuration
might
only
have
a
subset
of
these
addresses,
and
the
subset
might
not
be
contiguous.
You
need
to
know
what
CU
images
you
created
before
you
can
update
the
I/O
configuration.
Your
host
system
uses
the
updated
I/O
information
in
order
to
know
what
CU
images
are
on
the
DS8000.
Overview
of
the
input/output
configuration
program
for
the
DS8000
The
input/output
configuration
program
provides
the
information
needed
for
the
DS8000
when
handling
PAVs.
The
output
that
the
input/output
configuration
program
(IOCP)
generates
contains
the
I/O
definition
for
the
channel
subsystem
of
a
System
z
or
S/390
host.
It
is
not
used
as
input
to
the
I/O
definition
for
the
operating
system
for
the
System
z
or
S/390
host.
Therefore,
you
do
not
need
to
distinguish
between
bases
and
alias
devices
in
the
input
to
IOCP.
However,
doing
so
provides
an
accurate
representation
of
the
I/O
configuration.
The
operating
system
for
the
System
z
or
S/390
host
requires
that
the
input/output
definition
file
(IODF)
that
the
hardware
configuration
definition
(HCD)
creates,
specifies
base
and
alias
devices.
The
operating
system
dynamically
discovers
which
base
and
alias
devices
are
associated
with
each
other.
HCD
invokes
IOCP
to
build
an
IOCDS
that
identifies
the
I/O
definition
for
the
host
processor.
The
VM,
z/VM,
and
VSE
operating
systems
dynamically
discover
which
devices
are
bases
and
aliases
and
which
are
associated
with
each
other.
The
VM
and
z/VM
operating
systems
support
PAVs
for
guest
usage.
An
IOCP
example
The
following
is
an
IOCP
example
that
defines
ESCON
and
FICON
bridge
channel
path
IDs
that
you
have
attached
to
an
ESCON
director.
This
example
uses
the
storage
unit
machine
number,
2107.
HCD
users
can
use
the
information
in
the
following
IOCP
example
to
determine
how
to
define
a
storage
unit
to
HCD.
Chapter
8.
Optional
feature
codes
for
the
DS8000
103
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