As far as I know, virtual SSD can't be used as SSD cache. In my experience, SSD cache can only be used with pass-through-ing host SATA I/F and SSDs. If you tried with success, please post about that.     BTW, My recommended configuration for ESXi system is following.   In the following config, whole system is hosted with SSD cache & (almost) all drives are managed by DSM. It performs well and notifies me on any disk troubles. I'm satisfied with this co
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