I'm sorry, I was referring to hybrid storage as a technology category, not the hybrid disk drives like Seagate Momentus XT. You're right that a 2-drive hybrid (Fusion Drive) will mathematically be less reliable than a non-hybrid one and that those "hybrid disks" haven't lived up to the hype.
Pretty much every enterprise storage solution designed today is hybrid (SSD plus HDD) or all-flash and includes lots of advanced availability features.
Pretty much every enterprise storage solution designed today is hybrid (SSD plus HDD) or all-flash and includes lots of advanced availability features.