[NovaX]

The LHD paper lacks a robust analysis against different workloads. The few traces they use are either private or not considered representative workloads. For MSR, the provider (SNIA) specifically states: "WARNING: These traces are over 10 years old! They should not be used for modern research!".

It would be much more interesting if they used the traces from ARC and LIRS, perhaps also UMass and Wikipedia. These traces are publically available and used by multiple papers from a variety of groups.

I have not seen a sampling-based policy that outperforms a policy that has tracks history outside of its working set. Since the examples specifically avoided that comparison, I suspect that it under performs in comparison. That isn't to say it isn't a useful advancement, but that a more robust analysis is needed to validate their claims.