Ubuntu 20.04.3 and RAIDed root partition

Michael Hudson-Doyle michael.hudson at canonical.com
Thu Dec 9 02:36:08 UTC 2021

On Wed, 8 Dec 2021 at 18:43, Leroy Tennison <leroy.tennison at verizon.net>

> I have searched the web and what I have found (including the Ubuntu RAID
> guide) is either outdated or wrong.  In the installer (either the default
> or updated one):
> If I select "Use as Boot Device" for a device then the device is not shown
> as a device for "Create Software RAID"
> If I select "Use as Boot Device" for a device and "Add GPT Partition" (to
> create an unmounted partition for root) then I can't select a specific
> partition in "Create Software RAID"

If you create an unformatted partition, it should show up in the "create
RAID" dialog. The defaults are to format and mount the partition and then
it won't show up. Perhaps we should also show free space on drives in this
dialog and create the partition automatically if they are selected...

If I create a software RAID (mirroring) first then it can't be selected as
> a boot device
> All I have is terabyte size devices and can't afford to dedicate one as a
> bootable device.
> I'm now looking at installing Ubuntu without RAID then attempting to
> create a RAID of root after reboot but I can't seem to find how to do that
> either.
> Can you provide instructions (or a URL to same) for either method?  Thank
> you for your help.

Hope the above helps. I've wanted for a while to add a guided option to be
shown if there are multiple disks of around the same size but I've never
gotten around to it...


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