dstat shows unexpected result for two disk RAID1

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Hello everyone,

I've run into an expected behaviour for a my two disk RAID1.  I mount
with UUIDs, because sometimes my USB disk gets /dev/sdc instead of
/dev/sdd.  The two elements of my RAID1 are currently sdb and sdd.

dstat -tdD total,sdb,sdc,sdd

It seems that per process, reads come from either sdb or sdd.  This
surprises me, because I understood that a btrfs RAID1
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