Delayed Write Failed

I would disable the spin down on the primary NV+ and only have it on the secondary. I initially had spindown also set on my primary, but turned it off because of the delay in loading files. I did not have it set on my original NAS, also an NV+, and it ran for over 3 years 24/365 and put over 25,000 hours on my two original drives before they were replaced by larger drives. I know some thing that spin down will save wear and tear on the drives, but others think they are better off spinning consistently. High mileage automobiles that have had their miles on the open highway are in far better shape than ones with lower mileage but have all their miles in stop and go traffic.

I'm not convinced that spin down saves any electricity, as it takes more current to spin the drives up than to keep them spinning. Plus, the fan is still turning. That being said, I have spin down on my secondary NAS just to reduce the noise level a bit.

Disable the spin down on your primary and see if the problem goes away.