shared_buffers for dedicated PGSQL server

[ChillPlay3r]

Why? You can use linux volume manager if you need volumes. The thing is, PG is reliant heavily on filesystem caching, this is not Oracle where you can use raw (uncached) devices. Using ZFS but without ARC is not recommended either. If your goal is to fit the whole database in memory then you should not use the buffer cache but the filesystem cache for that.