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> Even my 24 TB NAS takes 24+ hours with no other activity

Your NAS sounds pretty slow, it shouldn't take an hour to scrub 1tb of data (on average)

I have 3x22 TB drives in a RaidZ1 pool with roughly 20TB of data and a scrub takes 18 hours. This sounds about right to me tbh.

VDEVs:

Data VDEVs - 4 x MIRROR, 2 wide, 12.73TB; Log VDEVs - 1 x DISK, 14.91TB, 1 wide; Cache VDEVs - 1 x 447.13 GiB

HW:

8 x WDC_WD140EFGX-68B0GN08; 2 x Micron_5300_MTFDDAK480TDS

Total space is 50.81TB of which 24.16TB is used. Frag on pool is reported at 21%.

Last Scrub took 11 hours 45 minutes 50 seconds.

Mine are WD Red Pros. I also have a 2TB WD Black SSD as a cache VDEV for the pool.

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.

---

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

I was off by 2x - last scrub took 12 hours.

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