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No, except possibly paid Solaris from Oracle (which has a newer version of ZFS), but that would probably cost a lot more than buying more disks.

What I do is have my ZFS in two "layers" (each of them 4 disks in raidz2, i.e. resilient against any two failures), and replace a whole layer at a time. So I started with 4x500GB drives for 1TB of capacity. Then I added 4x1TB drives, total capacity 3TB. Then I replaced the 500GB drives with 2TB drives, total capacity 6TB (and throwing away the 500GB disks, so "losing" 1TB). I'm shortly going to replace the 1TB drives with 4TB drives in the same way.

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