Hi Neil,
I guess that something is wrong with MD. If you create a RAID on ssd
(or scsi_debug in my example) than MD device is reported as rotational.
Simple example:
modprobe scsi_debug dev_size_mb=500
fdisk /dev/sdb
...
mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb{1,2}
# cat /sys/block/sdb/queue/rotational
0
# cat /sys/block/md0/queue/rotational
1
It seems like a bug.
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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