On Tue, Feb 17, 2015 at 05:04:16PM -0600, o1bigtenor wrote:
> Now I used gdisk to set things up so likely that is where I will need to
> start - - - hmmmmmmmmmmm.
>
> Has anyone done anything like this in the somewhat recent past?
>
> (Wondering if when disk is partitioned that mdadm will happily absorb that
> disk into the array. Likely will need another reboot too!)

There should be zero reboots required for this.

Most partition tools do a partition table reread automatically when you
exit, or you can use 'hdparm -z /dev/sdX' to do it.  If /proc/partitions
shows the new sizes, you are good to go.