If you have one zpool consisting of only one large raidz2, then you have a slow
raid. To reach high speed, you need maximum 8 drives in each raidz2. So one of
the reasons it takes time, is because you have too many drives in your raidz2.
Everything would be much faster if you split your zpool into two raidz2, each
consisting of 7 or 8 drives. Then it would be fast.
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