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Looking further, we wonder if this is an issue with block sizes and buffer offsets.

From https://www.gluster.org/pipermail/gluster-users/2015-September/023615.html:

Our gluster volume is a 7 x (2 + 1) (distributed disperse), but disperse volumes require "strict alignment of buffer offsets and block sizes. The disperse volume writes fragments multiples of 512 bytes in the bricks. If the underlying filesystem requires an alignment different than 512 bytes, it could cause the problem you are seeing. For example if the required alignment of the underlying filesystem is 4KB,you will need to write to the disperse volume in multiples of 12KB (you are using 3 data bricks)."

We use ZFS for our underlying filesystem, but there is no block size. We can set one, so we'll give that a shot and see what happens.

In the meantime, if anyone has an other ideas...