Integrated
Cluster
Bus
Channels
Integrated
cluster
bus
channels
(ICBs)
are
coupling
facility
channels
that
use
the
channel
subsystem’s
self-timed
interface
(STI)
cables
to
provide
the
connectivity
for
data
sharing
between
a
coupling
facility
and
the
CPCs
or
LPs
directly
attached
to
it.
This
allows
an
integrated
cluster
bus
channel
to
use
most
of
the
high
bandwidth
of
the
STI
bus.
Additionally,
the
improved
data
rate
made
possible
by
the
integrated
cluster
bus
channel’s
superior
bandwidth
enhances
performance
by
reducing
the
latency
of
synchronous
send
messages
and
CP
idle
time
which
results
in
improved
workload
throughput.
CPCs
that
use
integrated
cluster
bus
channels
can
be
no
more
than
approximately
7
meters
apart.
Integrated
cluster
bus
channels:
v
Require
CBP
channel
path
definition
(coupling
facility
peer
channel
capability)
at
the
coupling
facility
end
of
a
coupling
facility
channel
connection.
CBP
channel
paths
are
defined
for
ICB-3
and
ICB-4
links.
v
Require
CBP
channel
path
definition
(coupling
facility
peer
channel
capability)
at
the
z/OS
(and,
for
System-Managed
CF
Structure
Duplexing,
the
coupling
facility)
end
of
a
coupling
facility
channel
connection.
CBP
channel
paths
are
defined
for
ICB-3
and
ICB-4
links.
v
Each
CBP
channel
path
must
be
connected
to
another
CBP
channel
path.
ICB-3
and
ICB-4
links
are
both
defined
as
CBP
channel
paths.
However,
it
is
further
required
that
an
ICB-3
link
be
connected
to
another
ICB-3
link
and
that
an
ICB-4
link
be
connected
to
another
ICB-4
link.
Summary
of
CPC
Support
for
Integrated
Cluster
Bus
Channels:
Integrated
cluster
bus
channels
are
optional
on
System
z9
models.
High-Performance
Coupling
Facility
Channels
(HiPerLinks)
System
z9
high-performance
coupling
facility
channels
(HiPerLinks)
are
improved
coupling
facility
channels
(TYPE=CFP
channel
paths).
HiPerLinks
provide
improved
channel
efficiency
and
response
times
in
processing
coupling
facility
requests.
With
HiPerLinks,
coupling
facility
channel
capacity
is
improved
on
average
by
up
to
twenty
percent.
Existing
CPCs
that
do
not
have
HiPerLinks
as
their
coupling
facility
channels
can
connect
to
a
CPC
that
uses
HiPerLinks.
InfiniBand
host
channel
adapter
(HCA)
An
InfiniBand
host
channel
adapter
(HCA)
can
be
used
for
a
coupling
link
between
a
z/OS
image
and
a
coupling
facility
(CF)
image.
The
IOP
wraps
the
coupling
messages
in
an
InfiniBand
packet
and
uses
industry-standard
InfiniBand
link
architecture
to
send
the
message.
The
IOP
at
the
other
end
unwraps
the
coupling
message
and
delivers
it
to
the
intended
receiver.
InfiniBand
coupling
links
for
Parallel
Sysplex
InfiniBand
coupling
link
technology
provides
increased
bandwidth
at
greater
cable
distances.
The
IBM
System
z10
supports
a
12x
(12
lanes
of
fibre
in
each
direction)
InfiniBand-Double
Data
Rate
(IB-DDR)
coupling
link
which
is
designed
to
support
a
total
interface
link
data
rate
of
6
GigaBytes
per
second
(GBps)
in
each
direction.
The
maximum
distance
for
this
point-to-point
link
over
fibre
optic
cabling
is
150
2-56
PR/SM
Planning
Guide
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Summary of Contents for Z9
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