On Thu, Feb 19, 2015 at 04:14:04PM -0600, o1bigtenor wrote:
> On Thu, Feb 19, 2015 at 9:30 AM, Lennart Sorensen <
> lsorense@csclub.uwaterloo.ca> wrote:
>
> > 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.
> >
>
> Is there a way to partition the drive in a running system?
>
> The only way that I know of is to reboot onto a rescue disk and use gparted
> there
> to partition the drive.
>
> I have not been able to find anything using duckduck nor ms google.
>
> A complete back is just finishing as I write this.
>
> Thanking those that have contributed to the conversation for their
> assistance!!

Well cfdisk, parted, fdisk, gdisk, etc.

Somewhat depends if you need GPT or MBR style partition table.