ATS uses a tornado cache, where the write pointer just moves to the next object no matter what. So the disk cache doesn&#x27;t work as a LRU in the same way as other cache servers.<p>The benefit is that writing is fast and it&#x27;s constant time since you don&#x27;t have to do an LRU lookup to pick a place to store the object. The downside is that you are creating cache misses unnecessarily.<p>It&#x27;s never really been a problem for me in practice. If you have a lot of heartache over it, I would suggest putting a second cache tier in place. Very unlikely to strike out on both tiers.