This 5 year warranty is unfortunate limited with Wearout indicator (or Endurance Rating for easier calculation).

When SSD is used in CacheCade, data is written on it when we write into Datastore and also when we read uncached data.
So we should calculate endurance with adding all traffic to & from datastore.

Intel S3500, for example, has Endurance Rating 140 TBW for 240GB but 275 TBW for 480GB model.
That is good example why to use larger SSD.

When two nodes are used in active/passive mode and they are almost identical, it is good to change activity, time to time, because reading (and writing to SSD) process is only on active node. There is good example on my data - compare F1 SMART readout.