I installed Alfresco Community on An Ubuntu 16.04 Server which is a KVM guest. At the moment, I would like to increase storage by adding NFS or iScsi NAS. Should I move alf_data to this NAS ? And if so, how to do ? And if not, any suggestion to scale storage ?
you could "externalize" your contentstore (=document store).
alf_data/contentstore and alf_data/contentstore.delete can safely be mounted by NFS (first: move your documents to the new location)
As second step you can use another server for your database - transfer the alfresco database to another server and configure the db connection in alfresco/tomcat/shared/classes/alfresco-global.properties