That doesn't need kernel help
> Putting devices in "scan order" never made sense to me. Why should
> the first SCSI drive scanned be /dev/sda? What happens when I switch
> the cables and drives around. Same filesystems, but the devices have
> all changed.
And this doesnt need kernel help either. In fact using device scan order is
often more convenient than device position. When it comes to volume management
of a big system both of these (and Solaris) are equally dumb approaches.
It all comes down to
mount `wherehasitgone --uuid=blah` /mnt/mydisk
And wherehasitgone is a tool to walk the disk tree and find a volume by uuid
and/or maybe ask LDAP/NIS maps to find it via NFS
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