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by diplomatpuppy 4292 days ago
It really depends on the load and if your raidz has 1,2, or 3 spare drives. From what I've experienced, re-slivering a the new drive in a raidz seems to happen at about 30% of the maximum ZFS throughput under medium load. And even better than many RAID5/6 implementations - it only re-slivers enough to store your data and not just the entire drive.