Comment 6 for bug 1423809

Naohiro, if it's just adding sdc to the list of 'disk_devices', then you can actually set it in your environment in /etc/ironic/ironic.conf and then restart conductor.

I think it's still useful if the operator can specifyt the disk_devices because linux kernel might name the block devices based on it's type - one some systems it might /dev/sdX, on some other /dev/vdX, on some other /dev/cciss.

We should enhance diskimage-builder to support glob options in disk_device. Something like below:
disk_device='cciss/c[0-9]d[0-9],sd[a-z],hd[a-z],vd[a-z]'