I'm running five 8TB in a Z2 so I think that slows me down a bit more especially compared to people running mirrors. I'm going to kick a scrub off now and see if I'm misremembering.

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No need, looks like it ran a few weeks ago:

scrub repaired 0B in 12:43:52 with 0 errors on Mon Jul 6 20:58:58 2026