The following contents must be the same between OpenTP1s using the system switchover facility:

• OpenTP1 system definition information
• User server execution-form program
• Transaction service control execution-form program^# (if re-created with the trnlnkrm command)
• OpenTP1 and related program product version
• OpenTP1 administrator environment (user ID, group ID, and environment variables)
• OpenTP1 directory full path name
• OpenTP1 file setup

The OpenTP1 files to be used under the system switchover facility must be allocated to the OpenTP1 file system that has been created on a character type special file on the common disk.

ha_conf=Y (exchange systems) must be specified in the system configuration definition. Note, however, that you cannot use the transaction recovery journal file facility when the system switchover facility is being used. Do not specify trf_put=Y in the user service definition or the user service default definition.

In order for OpenTP1 to use the system switchover facility, the same host name must be used in the running and standby systems. Also, the same IP address corresponding to the host name must be used in the two systems.

If the my_host operand in the system common definition is specified, OpenTP1 uses it. If the operand is not specified, OpenTP1 uses the standard host name of the computer on which OpenTP1 works.

#

You must also execute the trnlnkrm command to make sure that the order of resource managers registered in OpenTP1 on the primary system is the same as the order on the secondary system.

The following table shows the combinations of host names OpenTP1 uses in the running and standby systems.

Table 9-1 Combinations of host names OpenTP1 uses in running and standby systems

Specification of OpenTP1 my_host operand in running and standby systems	Standard host name
	Same	Different
Same	Y	Y
Different	N	N
None	Y	N

Legend:

Y: Valid

N: Invalid