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Extend compcache http://code.google.com/p/compcache/ to cache disk reads/writes to a block device (SSD), use LRU or ARC. Look at cleancache (2.6.37) and integrate from there. This will allow for compressed ARC/LRU based caching similar to zfs's l2arc.

Do you know if compcache has finally been integrated in the kernel?

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