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# create a raid1 array with a wrmostly device
mdadm -CR $md0 -l1 -n3 $dev0 $dev1 --write-mostly $dev2
testdev $md0 1 $mdsize1 1
# unfortunately, we cannot measure if any read requests are going to $dev2
mdadm -S $md0
mdadm -CR $md0 -l1 -n3 --write-behind --bitmap=internal --bitmap-chunk=4 $dev0 $dev1 --write-mostly $dev2
testdev $md0 1 $mdsize1 1
mdadm -S $md0
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