On Mon, Feb 25, 2019 at 06:44:57AM +1100, Andrew Greig wrote:
> Now it is time to see if I have learned anything.
>
> 1Tb SSD and 2 x 2Tb SATA HDDs, motherboard is a UEFI board but I have never
> used UEFI with this board.
>
> Ubuntu desktop obviously ignored it.
>
> Using Gparted partition the SSD thus:
>
> 512MB EFI Partition /dev//sda1, formatted FAT32, primary       (boot?)
> 8 Gb allocated to SWAP
>
> rest of the disk _*/*__dev/_sda2, primary, formatted btrfs mounted as /

Looks good except that if you have an EFI partition (sda1) and a swap
partition (sda2) then the btrfs root partition will be sda3, not sda2.

> Partition the first HDD /dev/sdb1primary, formatted btrfs , mounted as /data
>
> Second HDD same size leave completely blank

The second 2TB HDD (sdc) needs to be partitioned exactly the same as the first
(sdb).

I don't think gparted will let you create a partition without formatting it
(as a filesystem or as swap or whatever), so just let it format the partition
and then run the btrfs commands as below.

> After the system is installed add the second HDD withtwo lines in the
> terminal
>
>           sudo btrfs device add -f /dev/sdc1 /data
>           sudo btrfs balance start -dconvert=raid1 -mconvert=raid1 /data

You can do this after the system is installed, or from a root shell while
booted on gparted.  It doesn't matter either way, although it's probably
better/easier to do it from gparted (there'll only be the one /data fs for the
ubuntu installer to detect so you won't end up with /data0 and /data1 again)

craig

--
craig sanders <[email protected]>
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