> To me it seems that writes are not directed properly to the devices that have 
> most free space - almost exactly the opposite. The writes seem to go to the 
> devices that have _least_ free space, instead of the devices that have most 
> free space.  The same effect that can be seen in these 60s averages can also 
> be observed in a shorter timespan, like a second or so.

> Is there something obvious I'm missing?


Not sure how OI should behave, I've managed to even writes & space usage 
between vdevs by bringing device offline in vdev you don't want to writes end 
up to.
If you have degraded vdev in your pool, zfs will try not to write there, and 
this may be the case here as well as I don't see zpool status output.

Yours
Markus Kovero

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