On Sun, Nov 13, 2011 at 15:30:32 -0500, Sam Varshavchik mrsam@courier-mta.com wrote:
At bootup, the new array gets automounted on /dev/md127 for some reason. Everything's fine, I see no issues except for the unexpected device minor number.
Anyone care to enlighten me, how mdraid minor numbers get handed out, and why the one I manually created comes up as a high number, even though the next free minor device is, obviously, /dev/md3.
Some of this is controlled by /etc/mdadm.conf. This file is used when running dracut to build an initramfs.
For arrays that aren't listed in /etc/mdadm.conf, I think udev gets to pick the names. They seem to start at 127 and go up.
There is also a minor number that is stored in the superblocks, but it doesn't seem to force that number to be part of the device name.