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If you want four independent and separate instances of the repository / share its probably easiest to configure four separate instances of tomcat. Its just a matter of configuring separate sets of ports and the database. Or another option is to have multiple IP addresses on each box and use the same ports but a different IP address for each server.And please note you should be configuring share thoughshare-config-custom.xmland the repo through alfresco-global.properties.