4 disks in a Raid Z2 makes no sense. You only get 32TB of storage, and you can lose 2 disks. Setting up two mirror pools gives you the same 32TB of storage, 2 disk failure buffer, and will be significantly faster.
I beg to differ:
- Two mirrored VDEVs do NOT give you 2-disk redundancy, only 1-disk redundancy in the worst case.
- With raidz expansion you can improve the storage to parity ratio, something you can NOT do with mirrored VDEVs.
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