For a HiRDB/Parallel Server, the HiRDB administrator must create HiRDB system definition files and manage them for each server machine. However, if the file sharing facility (NFS) provided by Hitachi CSMA/CD Network CD105 (TCP/IP) is used, all the HiRDB system definition files, except for unit control information definition files, can be managed by a single server machine. This is called sharing HiRDB system definition files. Figure 5-5 shows an example of sharing HiRDB system definition files.
Figure 5-5 Sharing HiRDB system definition files
When not shared | When shared |
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HiRDB system definitions must be managed for each server machine. | HiRDB system definitions (except for unit control information definitions) can be managed by one server machine. |
When the system common definition is modified, the same modifications must be made as many times as there are server machines. For example, if there are four server machines, there are four system common definitions. Because the contents of these four system common definitions must be identical, all four definitions must be modified. |
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To share HiRDB system definition files, do the following: