Shared
Devices
Using
Shared
Channels
MIF
allows
you
to
use
shared
channels
when
defining
shared
devices.
Using
shared
channels
reduces
the
number
of
channels
required,
allows
for
increased
channel
utilization,
and
reduces
the
complexity
of
your
IOCP
input.
Note:
You
cannot
mix
shared
and
unshared
channel
paths
to
the
same
control
unit
or
device.
The
following
is
an
example
of
an
IOCDS
with
a
shared
device.
The
following
is
the
IOCP
coding
for
the
above
figure.
CHPID
PATH=(30),TYPE=CNC,SWITCH=03,SHARED
.
.
.
CHPID
PATH=(34),TYPE=CNC,SWITCH=03,SHARED
.
.
.
CNTLUNIT
CUNUMBR=000,PATH=(30,34),UNITADD=((90)),LINK=(E0,E0),UNIT=xxx
.
.
.
IODEVICE
ADDRESS=(190),CUNUMBR=000,UNIT=xxx
.
.
.
Shared
Devices
Using
Unshared
Channels
When
coding
an
IOCP
input
file,
the
following
specifications
are
allowed:
v
Duplicate
device
numbers
can
be
specified
within
a
single
IOCP
input
file,
if
device
numbers
are
not
duplicated
within
an
LP.
v
You
can
assign
a
maximum
of
eight
channel
paths
from
each
LP
to
a
device.
Device
sharing
among
LPs
is
accomplished
by
attaching
multiple
channel
paths
from
each
LP
to
a
device.
The
following
section
illustrates
IOCP
coding
for
IOCDSs
when
shared
devices
on
unshared
channels
and
duplicate
device
numbers
are
specified.
Shared
Devices:
The
following
examples
illustrate
this
concept
by
showing
the
physical
connectivity
of
an
I/O
configuration
for
multiple
LPs
and
the
IOCP
coding
for
the
same
configuration.
Using
Channels:
shows
an
example
of
an
I/O
configuration
with
a
device
shared
by
each
of
the
four
logical
partitions.
In
this
representation
of
a
shared
device,
each
logical
partition
views
device
190
as
part
of
Logical
Partition
A
Logical
Partition
B
Logical
Partition
C
Logical
Partition
D
190
CHP
CHP
30
34
C0
C5
Switch 03
E0
Figure
2-12.
Shared
Devices
Using
Shared
ESCON
Channels
Chapter
2.
Planning
Considerations
2-31
Summary of Contents for Z9
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