Chapter 3. Central processor complex system design 105
In Figure 3-13, the CPC on the left has two environments that are defined (production and
test), each of which has one z/OS and one coupling facility image. The coupling facility
images share an ICF.
Figure 3-13 ICF options: Shared ICFs
The LPAR processing weights are used to define how much processor capacity each coupling
facility image can have. The capped option can also be set for a test coupling facility (CF)
image to protect the production environment.
Connections between these z/OS and coupling facility images can use internal coupling links
to avoid the use of real (external) coupling links, and get the best link bandwidth available.
Dynamic coupling facility dispatching
The dynamic coupling facility dispatching function has a dispatching algorithm that you can
use to define a backup coupling facility in an LPAR on the system. When this LPAR is in
backup mode, it uses few processor resources. When the backup CF becomes active, only
the resources that are necessary to provide coupling are allocated.
CFCC Level 19 introduced Coupling Thin Interrupts and the new DYNDISP specification. It
allows more environments with multiple CF images to coexist in a server, and to share CF
engines with reasonable performance. For more information, see 3.9.3, “Dynamic CF
dispatching” on page 133.
3.5.5 IBM z Integrated Information Processor
A zIIP
3
reduces the standard processor (CP) capacity requirements for z/OS Java, XML
system services applications, and a portion of work of z/OS Communications Server and DB2
UDB for z/OS Version 8 or later, freeing up capacity for other workload requirements.
A zIIP enables eligible z/OS workloads to have a portion of them directed to zIIP. The zIIPs do
not increase the MSU value of the processor, and so do not affect the IBM software license
changes.
The z13s server is the first business class z Systems Processor to support SMT. z13s servers
support two threads per core on IFLs and zIIPs only. SMT must be enabled at the LPAR level
z/OS
Prod
z/OS
Prod
Setup
HMC
Partition
Image
Profile
ICF
CP
CF
CF
Test Sysplex
z/OS
Test
z/OS
Test
CF
z/OS
Prod
z/OS
Prod
Setup
HMC
Partition
Image
Profile
ICF
CP
CF
CF
Test Sysplex
z/OS
Test
z/OS
Test
CF
3
z Systems Application Assist Processors (zAAPs) are not available on z13s servers. A zAAP workload is
dispatched to available zIIPs (zAAP on zIIP capability).
To Next Page
Loading...
Need help?
General