Based on our testing, we get much better compression using ZFS than PGSQL. As a side benefit, we also get snapshots and the ability to easily find out how much

Based on our testing, we get much better compression using ZFS than PGSQL. As a side benefit, we also get snapshots and the ability to easily find out how much compression our DBs are getting. According to a quick google search (to refresh my memory), PGSQL compression (eg: TOAST) targets specific large data values within tables, while ZFS compresses all data written to the ZFS pool.