6947ch07.fm Draft Document for Review April 7, 2004 6:15 pm
164 IBM eServer zSeries 990 Technical Guide
For availability reasons, there should be:
򐂰At least two coupling links between z/OS and/or OS/390 and Coupling Facility images
򐂰At least two Coupling Facility images (not running on the same server)
򐂰At least one standalone Coupling Facility (if using system-managed CF structure
duplexing or running with “Resource Sharing” only, then a standalone Coupling Facility is
not mandatory)
– At least two Coupling Facility images are required for system-managed CF structure
duplexing
7.2.5 Coupling Facility Resource Manager (CFRM) policy considerations
Because the z990 is capable of having greater than 15 logical partitions, there is a change in
the usage of the ‘PARTITION’ keyword when defining the CFRM policy via the administra tion
utility. Support has been added to allow for two digits in the keyword ‘PARTITION(nn). The
meaning of keyword also depends upon if the CF location resides on a z990 or non-z990, see
Figure 7-3 for more details.
If the CF LPAR id on the z990 is equal or less than x' F’, then z/OS compatibility support is not
required on z/OS partitions running on non-z990 processors; see 6.2.1, “Compatibility
support for z/OS” on page 134.
Figure 7-3 CFRM Policy changes
7.2.6 ICF processor assignments
The advantage of using ICF Processors (PUs characterized as ICFs) instead of CPs for
Coupling Facility images is that, because an ICF cannot run any z/OS or OS/390 operating
systems, software licenses are not charged for those processors.
CFRM Policy utility now accepts 2 digit PARTITION values
Restriction: must have compatibility or exploitation
function installed on all systems in the SYSPLEX to use
two digit partition values
DATA TYPE(CFRM) REPORT(YES)
DEFINE POLICY NAME(POLICY1)
REPLACE(YES)
CF NAME(FACIL01)
TYPE(123456)
MFG(IBM)
PLANT(02)
SEQUENCE(123456789012)
PARTITION(01)
DUMPSPACE(2000)
CF NAME(FACIL02)
TYPE(123456)
MFG(IBM)
PLANT(02)
SEQUENCE(123456789012)
PARTITION(11)
DUMPSPACE(2000)
Meaning of PARTITION
Non z990 - Partition number assigned when you
defined CF partition to HCD or IOCP
z990 - LPAR identifier specified for CF partition in the
LPAR image profile
Applicable to both compatibility and exploitation systems
Note: There must be spare PUs to order dedicated ICFs. Refer to 2.2, “System design” on
page 37’ for details.