linux-kernel - MD and rotational attribute

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Message-ID: <20120220122022.GA7466@x2.net.home>
Date:	Mon, 20 Feb 2012 13:20:22 +0100
From:	Karel Zak <kzak@...hat.com>
To:	Neil Brown <neilb@...e.de>
Cc:	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org
Subject: MD and rotational attribute

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@...hat.com>
 http://karelzak.blogspot.com
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