The TAKEOVR system initialization parameter specifies
the action to be taken by the alternate CICS region, following the apparent
loss of the surveillance signal in the active CICS region.
- TAKEOVR={MANUAL|AUTO|COMMAND}
(alternate)
- Use this parameter in the SIT for an alternate CICS region. This parameter
also specifies the level of operator involvement.
If both active and alternate
CICS regions are running under different MVS images in the same sysplex, and
an MVS failure occurs in the MVS image of the active CICS region, the TAKEOVR
option is overridden.
- If the MVS images are running in a PR/SM™ environment, CICS XRF takeover to
an alternate CICS region on a separate MVS image completes without the need
for any operator intervention.
- If the MVS images are not running in a PR/SM environment, the CICS takeover
is still initiated automatically, but needs operator intervention to complete,
because XCF outputs a WTOR (IXC402D). Sysplex partitioning does not complete
until the operator replies to this message, and CICS waits for sysplex partitioning
to complete before completing the XRF takeover.
- MANUAL
- The operator is asked to approve a takeover if the alternate CICS region
cannot detect the surveillance signal of the active CICS region.
The alternate
CICS region does not ask the operator for approval if the active CICS region
signs off abnormally, or if there is an operator or program command for takeover.
In these cases, there is no doubt that the alternate CICS region should take
over, and manual involvement by the operator would be an unnecessary overhead
in the takeover process.
You could use this option, for instance, to
ensure manual takeover of a master or coordinator region in MRO.
- AUTO
- No operator approval, or intervention, is needed for a takeover.
- COMMAND
- Takeover occurs only when a CEBT PERFORM TAKEOVER command is received
by the alternate CICS region. It ensures, for instance, that a dependent alternate
CICS region, in MRO, is activated only if it receives the command from the
operator, or from a master or coordinator region.
Last updated: Thursday, 27 June 2019