When MSCS's system switchover facility is used, only one unit is subject to extraction in both running and standby systems in the following cases:

• Multiple HiRDB units are running on the same server machine.
• In the mutual system switchover mode, multiple HiRDB units are able to run on the same server machine.

In HDEPATH or HDSPATH for the primary and standby server machines, specify the pathname on the shared disk. The following limitations apply to the characters that can be used for path and directory names on the shared disk:

• Use either upper-case letters or lower-case letters consistently.
• Directory names can consist of only single-byte alphanumeric characters.
• Spaces, double-byte characters, and special symbols are not permitted.

Next, specify the system environment variables. The following table provides the details.

Table 6-19 Settings for the system environment variables (when MSCS's system switchover facility is used)

Classification	System environment variable	Setting in primary and standby systems
Source Datareplicator	HDEPATH	Path to the folder storing the extraction system definition file (hdeenv)
	PDDIR	PDDIR of the unit that contains MGR
	PDCONFPATH	PDCONFPATH of the unit that contains MGR
	PATH	Path to the source Datareplicator's command library#
Target Datareplicator	HDSPATH	Path to the folder storing the import system definition file (hdsenv)
	PDDIR	PDDIR of the target HiRDB
	PDNAMEPORT	Port number of the target HiRDB
	PDHOST	Host name of the target HiRDB
	PATH	Path to the target Datareplicator's command library#

#

Normally, this information is set automatically during installation of Datareplicator. If automatic setting results in an error due to the length of the PATH environment variable, you must specify this setting manually.

A client environment definition is required to execute the hdeprep and hdeevent commands at the source Datareplicator. For details about the client environment definition, see the HiRDB Version 9 UAP Development Guide.

The following table describes the Datareplicator service settings required to use the system switchover facility.

Table 6-20 Datareplicator service settings

Classification	Service name	Startup type	Registration into MSCS
Source Datareplicator	HiRDB Datareplicator (Source site)	Manual	Registered
	HiRDB Datareplicator (Source site NMT)	Automatic	Not registered
Target Datareplicator	HiRDB Datareplicator (Target Site)	Manual	Registered

To use the system switchover facility, you must allocate the Datareplicator files to a shared disk unit.

Create all the files listed in Table 6-18 Preparation of files for using the system switchover facility, including the Datareplicator directory (specified in the HDEPATH and HDSPATH environment variables), on an external hard disk that is shared by the primary and secondary systems, and specify the settings so that both Datareplicators can reference the files using the same paths.

The table below shows the resources that are to be registered into MSCS. For details about how to perform the registration, see the MSCS documentation.

Table 6-21 Resources to be registered into MSCS

Classification	Definition item	Resource	Name	Dependency
Source Datareplicator	Shared disk used at the source Datareplicator#1	Shared disk	Any name	None
	Network name#2	Network name
	IP address#2	IP address
	Start service of the source Datareplicator	General-purpose service	HiRDB Datareplicator extract	Start service of HiRDB
Target Datareplicator	Shared disk used at the target Datareplicator#3	Shared disk	Any name	None
	Network name#2	Network name
	IP address#2	IP address
	Start service of the target Datareplicator	General-purpose service	HiRDB Datareplicator reflect	Start service of HiRDB Shared disk

#1

Add the shared disk as a dependency of Start service of HiRDB.

#2

Use the name set in HiRDB.

#3

Add the shared disk as a dependency of Start service of the target Datareplicator.

Set the following network configuration elements to inherit IP addresses:

• Between the extraction master process and the extraction node master process of the source Datareplicator
• Between source and target Datareplicators