> if zfs overlaps mirror reads across devices.
it does... I have one very old disk in this mirror and
when I attach another element one can see more reads going
to the faster disks... this past isn't right after the attach
but since the reboot, but one can still see the reads are
load balanced depending on the response of elements
in the vdev.
13 % zpool iostat -v
capacity operations bandwidth
pool used avail read write read write
---------- ----- ----- ----- ----- ----- -----
rpool 7.01G 142G 0 0 1.60K 1.44K
mirror 7.01G 142G 0 0 1.60K 1.44K
c9t1d0s0 - - 0 0 674 1.46K
c9t2d0s0 - - 0 0 687 1.46K
c9t3d0s0 - - 0 0 720 1.46K
c9t4d0s0 - - 0 0 750 1.46K
but I also support your conclusions.
Rob
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