On Thu, 3 Sep 2015, gregrwm wrote:

> you want to upgrade.  seems to me the easiest, quickest, and most 
> trustworthy way to proceed is reinstall.

That makes sense.  I have to make sure I get the instructions right this 
time.  I seem to have missed a step last time.


> and while you're at it setup your discs so you have 2 complete and 
> distinct installations simultaneously.  that way the next time around 
> you can install the next before/without overwriting what's working.

I have no idea how to do that.


> i have 2 discs and build raid1 sets by setting the 2 discs up with 
> identical partitions, on each disc i put two 300mb boot partitions, two 
> 10gig swap partitions, and the rest of the space equally divided between 
> two lvm partitions.

I wouldn't know how to do that, either.

Suppose I have two 3 TB disks, sda and sdb and I just want RAID1 with 300 
MB /boot, 32 GB swap and the rest in /.  How do I do it?

I posted very detailed instructions explaining exactly how I did it 
several years ago, but now I know that those instructions were flawed.

Can you figure out what I did wrong here?:

http://shadowknight.real-time.com/pipermail/tclug-list/2012-May/062090.html

This part seems especially suspicious:

"Note that I did not add /boot to the RAID -- that will cause Ubuntu to
fail to load GRUB, so don't do that."

Maybe /boot has to be added afterward?  Or maybe that's just wrong.  I'm 
sure I read it somewhere.  What seems to have happened is that Ubuntu made 
a /boot directory in the / partition of the RAID, but that did not work.

Mike