> From: Pasi Kärkkäinen [mailto:pa...@iki.fi]
> What's the correct way of finding out what actually uses/reserves that 1023G
> of FREE in the zpool?

Maybe this isn't exactly what you need, but maybe:

for fs in `zfs list -H -o name` ; do echo $fs ; zfs get 
reservation,refreservation,usedbyrefreservation $fs ; done

> At this point the filesystems are full, and it's not possible to write to them
> anymore.

You'll have to either reduce your reservations, or destroy old snapshots.  Or 
add more disks.

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