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.<p>What I do is have my ZFS in two &quot;layers&quot; (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 &quot;losing&quot; 1TB). I&#x27;m shortly going to replace the 1TB drives with 4TB drives in the same way.