Paul Richards wrote at 2009-09-02 05:30 -0500: > Is there a way to combine a large slow drive with a fast small drive > in such a way that the faster drive simply becomes a cache for the > larger drive? > > I imagine a computer where I'd like to have a small fast SSD and a > large but slow spinning disk. I'd like to put the two block devices > together so that I'm presented with a single logical block device, > where the operating system is using the SSD as a cache (either > inclusive or exclusive, write-though or otherwise) of the spinning > disk. > If there is nothing at the block device level can it be done at the > filesystem level? This reminds me of the FSCACHE kernel option, of which I know nothing but the config description: "This option enables a generic filesystem caching manager that can be used by various network and other filesystems to cache data locally. Different sorts of caches can be plugged in, depending on the resources available. See Documentation/filesystems/caching/fscache.txt for more information."
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