這是一個比較單純的作法，用兩部機器當作DB Server，後面去掛載一個NAS的分享目錄，然後把資料庫的檔案放到NAS去。由Heartbeat來自動切換Active和Standby角色。
參考資料
http://momjian.us/main/writings/pgsql/replication.pdf
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Deploy PostgreSQL HA with NAS + HeartBeat.ppt |
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Deploy PostgreSQL HA with NAS+Heartbeat |
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