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What are the ways of processing system installation to the server (servers)?

April 26, 2017installation server servers system

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What are the ways of processing system installation to the server (servers)?

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There are 4 ways of this software installation: 1. Installation into one server. It is ideal for small numbers of selling services and registered terminals. 2. Installation into two servers. While one server is used for Web-interface and database backup the second one processes transaction and stores database. 3. One licensed software is installed into two servers with database replication. It is the most secure way in case when one server is down, the second one goes on operating. 4. Installation into three servers. While one server is used for Web-interface and database backup the other two with database replication process transactions.