I've written about my slow-to-dedupe RAIDZ.

After a week of.....waiting....I finally bought a little $100 30G OCZ
Vertex and plugged it in as a cache.

After <2 hours of warmup, my zfs send/receive rate on the pool is
>16MB/sec (reading and writing each at 16MB as measured by zpool
iostat).
That's up from <3MB/sec, with a RAM-only cache on a 6GB machine.

The SSD has about 8GB utilized right now, and the L2ARC benefit is amazing.
Quite an amazing improvement for $100...recommend you don't dedupe without one.

mike
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