There is md-cache or you could try bcachefs.

I have used md-cache caching to SSD and it looks to make a really significant speed improvment.

I tried bcache a few years ago but it was a pain since it was not yet integrated into the Fedora code base and although bcachefs looks interesting I believe its still a case of build your own kernel to run it.

I'm running Fedora, and want a filesystem with a write cache that I can put on flash, as I occasionally run some evil write-intensive tasks. I'd love to simulate the Sun trick of flash for write cache and ephemeral for read cache.

Alas, my brain is roughly at the samfs/qfs level (a predecessor of zfs) and it's not clear what of the more modern filesystem I should consider for everyday use.

--dave

-- 
David Collier-Brown,         | Always do right. This will gratify
System Programmer and Author | some people and astonish the rest
davecb@spamcop.net           |                      -- Mark Twain

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