I'm glad my RAID1 worked as expected... just hoping I don't encounter
any read timeouts on the non-TLER drive before my rebuild finishes:
# mdadm --manage --add -v /dev/md2 /dev/sdb2
mdadm: added /dev/sdb2
# cat /proc/mdstat
Personalities : [raid1]
md2 : active raid1 sdb2[3] sda2[2]
976510840 blocks super 1.2 [2/1] [_U]
[>....................] recovery = 1.9% (19032256/976510840)
finish=350.1min speed=45575K/sec
unused devices: <none>
# iostat -k 1 -x /dev/sd[ab]
avg-cpu: %user %nice %system %iowait %steal %idle
1.63 0.00 20.65 0.00 0.00 77.72
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s
avgrq-sz avgqu-sz await svctm %util
sda 0.00 0.00 1584.00 0.00 101376.00 0.00
128.00 2.84 1.80 0.39 61.60
sdb 0.00 3.00 0.00 1584.00 0.00 101568.00
128.24 27.72 17.70 0.63 99.60
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