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Particularly interesting is the possibility of using a SSD as a cache for a HDD just like the Fusion Drive in the recent iMacs (https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux....)

Reviews were quite positive of Apple implementation. Has anybody tried the linux version ?

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I've got flashcache running on a 20GB SSD partition fronting a 120GB spinning disk partition, on a desktop at home. It feels (anecdotal, subjective) as fast as a pure SSD for all normal desktop things. I also ran a small MySQL db through this setup for a few weeks, and that improved noticeably over a single spinning disk, especially when there was IO load from other processes.

The install procedure is a little rough around the edges, so I'm looking forward to having that more polished.

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