I may have answered the question incorrectly. For our enterprise SSDs we expect on worst case to hit 5 drive writes per day for what we do so we plan for that by using a drive rated for at least 5 WPD. This of course will depend on our customer's use-case but we have to plan for the higher end. In my specific project, we mirror two SSDs across two physical systems using DRBD and the device is used as a zfs SLOG device. The majority of our writes are synchronous which means the SSD gets used very frequently.