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ZFS Dedupliciation
For deduplication, it is recommended to have L2ARC cache size of 2-5GB per 1TB of disk.
Turn on
Enable deduplication:
zfs set dedup=on tank/data
Turn off
Once all deduped datasets are destroyed the dedup table will be removed and the performance impact is cleared.
status
zpool status -D rpool zdb -DD rpool