The storage space required by the HiRDB/Single Server must be estimated. For details about the storage requirements for a HiRDB/Single Server, see 16.1 Estimating the memory size required for a HiRDB/Single Server.
It may not be possible to install a desired input/output device (such as MT drives) to be used by utilities at the HiRDB/Single Server machine because of I/O device restrictions. In such a case, the I/O device can be installed on a separate server machine and can be used by the utilities via a LAN. A server machine on which only input/output devices are installed for use by utilities is called a utility special unit.
A utility special unit is used by the following utilities:
For details about how to use a utility special unit with execution of utilities, see the manual HiRDB Version 8 Command Reference.
When an input/output device cannot be installed at the HiRDB/Single Server machine, installation of a utility special unit should be considered.
One utility special unit can be shared among multiple HiRDB/Single Servers.