This topic has a procedure for removing a coupling facility (CF)
from the configuration when all CF structures can be removed from
the CF. If not all structures can be removed from the CF (for example,
the Parallel Sysplex® configuration
is a global resource serialization star complex with a single usable
CF), then see Transitioning from a Parallel Sysplex to a base sysplex.
Take the following actions to delete a CF from the CFRM active
policy:
- Define a new CFRM policy that does not include any
reference to that CF - this includes the CF definition and the CF
name in structure preference lists. When removing the CF from a preference
list, ensure the preference list contains the CF into which the structure
will be rebuilt (or duplexed).
When the CF is being removed only
temporarily, use a name for the new CFRM policy that is different
from the name of the current CFRM policy so that the CF can be restored
to the sysplex using the original/current policy.
- CHPIDs being used for connectivity between all systems and the
CF should be recorded at this point. The CHPIDs used for connectivity
between all systems and the CF can be obtained using the ROUTE
*ALL,DISPLAY CF,CFNAME=cfname command.
Information about
CF connectivity to systems and CF characteristics is returned in message
IXL150I. Record the following information that uniquely identifies
the CF to each system:
- NODE DESCRIPTOR (type.mfg.plant.sequence)
- PARTITION
- CPCID
- CHPID's (listed under SENDER PATH heading)
- Activate the new policy with the SETXCF START,POLICY,TYPE=CFRM,POLNAME=polname2 system
command.
The policy changes to remove the CF definition and the
policy changes to the preference list of allocated structures may
become pending. Verify the deletion or pending deletion of the CF
from the CFRM active policy can be verified with the DISPLAY
XCF,CF,CFNAME=cfname system command.
- Remove all structures from the CF. See Removing structures from a coupling facility for shutdown for guidelines on removing all structures from a CF
that is pending deletion from the CFRM active policy.
Unless REALLOCATE
is used, any change to the preference list of a structure that was
not allocated in the CF being removed might remain pending.
After
all structures are removed from the CF, the CF will be deleted from
the active policy. Deletion of the CF from the active policy can be
verified with the DISPLAY XCF,CF,CFNAME=cfname system command
.
- Using the CHPIDs from a preceding step, on all systems,
place all paths to the CF offline with the CONFIG CHP(chpxx,chpyy...),OFFLINE system
command.
Verify the unavailability of the CF on all systems with
the DISPLAY M=CHP(chpxx,chpyy...) system command.
- SHUTDOWN the CF.
The CF can be removed from the I/O configuration when preceding
actions are complete.
If making changes to CF elements (CF control units or CF channel
paths) in the I/O configuration, ensure that SOFT=VALIDATE is specified
on the ACTIVATE system command. SOFT=VALIDATE is a requirement in
all N-1 partitions when changes to CF elements are made.
See z/OS HCD Planning and z/OS HCD User's Guide for
additional information on deleting a CF from an I/O configuration.
See Adding a Coupling Facility for a procedure to restore the CF to the
sysplex.