grwilson commented on this pull request.
> @@ -1039,6 +1039,13 @@ metaslab_group_allocatable(metaslab_group_t *mg,
> metaslab_group_t *rotor,
if (mg->mg_no_free_space)
return (B_FALSE);
+ /*
+ * Relax allocation throttling for ditto blocks. Due to
+ * random imbalances in allocation it tends to push copies
+ * to one vdev, that looks a bit better at the moment.
+ */
+ qmax = qmax * (4 + d) / 4;
Out of curiosity, did you find that it made a difference to increase the qmax
value between the 2nd and 3rd DVAs? Or is equally efficient to say any DVA > 1
gets to go over the qmax value by 25%?
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