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I have an ultrabook with two discs, an HDD with 500GB and an SSD with 32GB.

My SSD is partitioned for /boot, / and /efi, and my HDD is for SWAP and /media/userdata (mainly, media).

I was thinking of have /home on a logical partition between the HDD and SSD (should be /dev/sda4 and /dev/sdb2), but I think the HDD io would impact in my performance (for programs startup, user configurations, etc.).

So, is it possible to make LVM write large files (> 4MB, by example, or according to file type) to HDD, and small ones (or every .hidden file/dir) to SSD?

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    I don't think LVM can do this, but you could also consider using bcache, recently merged in the kernel, which will use ssd for caching automatically.
    – Paul
    Dec 4, 2013 at 4:00
  • I see. But how does LVM behave with diferent disk sizes? Since my HDD has 500GB and SSD about 20GB (not mirrored), is it possible to foresee (or add some rule) where will it write?
    – paulodiovani
    Dec 4, 2013 at 11:03
  • @Paul, bcache seems a good approach, but as I can see, the cache device starts at zero, so every first-read is from HDD. So it may not help to apps startup.
    – paulodiovani
    Dec 4, 2013 at 11:37

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