Interstage Shunsaku Data Manager Operator's Guide - Microsoft(R) Windows(R) 2000/ Microsoft(R) Windows Server(TM) 2003 - - UNIX -

2.2.1 Designing the Process Configuration

Design the Shunsaku process configuration. Design how many searchers and directors will be used.

Determining the Number of Searchers

Determine the number of searchers to use according to the amount of data that will be allocated to the searchers.

The data that is placed on a searcher is loaded into the searcher's memory.

Determine the number of searchers based on the total amount of data to be stored in Shunsaku. Avoid too much data being placed on each searcher. Considering fluctuations of memory usage and search performance, it is recommended that no more than approximately 1 GB of data be placed on a single searcher.

Note also that during degradation, the data of the searcher experiencing a problem will be allocated to the remaining searchers and loaded into their memories. This means that the amount of data during degradation as well as fluctuations in memory usage, search performance, and other factors involved must be considered when determining the number of searchers.

Searchers can be added while the system is in operation. Therefore, even if the volume of data exceeds the estimate made during the design phase, it is possible to simply add another searcher and continue operating normally.

Refer to D.5 Estimating Resources for Searcher for more information on searcher memory usage.

Determining the Number of Directors

Determine the number of directors, taking into account the number of searchers, the amount of memory used by directors, and the Shunsaku operating method.

The maximum number of searchers that can be registered with a single director is 20, so if the number of searchers is greater than this number, more than one director must be used.

Furthermore, there is a maximum limit on the amount of memory that can be used by a single director. Ensure that each director uses no more than approximately 1.5 GB of memory. If the director is likely to use more than 1.5 GB of memory, multiple directors are required.

Refer to D.3 Estimating Resources for the Director for more information on how to calculate the amount of memory used by directors.

Directors can be added while the Shunsaku system is operating.

Therefore, even if more searchers are added than the estimate made during the design phase, it is possible to simply add another director and continue operating normally.