Re: btrfs raid1 and btrfs raid10 arrays NOT REDUNDANT

Chris Samuel
2014-01-07T05:43:43Z

On 07/01/14 06:25, Jim Salter wrote:

> FWIW, Ubuntu (and I presume Debian) will work just fine with a single /
> on btrfs, single or multi disk.
>
> I currently have two machines booting to a btrfs-raid10 / with no
> separate /boot, one booting to a btrfs single disk / with no /boot, and
> one booting to a btrfs-raid10 / with an ext4-on-mdraid1 /boot.

Actually I've run into a problem with grub where a fresh install cannot
boot from a btrfs /boot if your first partition is not 1MB aligned
(sector 2048) then there is then not enough space for it to store its
btrfs code. :-(

https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1266195

I don't want to move my first partition as it's a Dell special (type
'de') and I'm not sure what the impact would be, so I just created an
ext4 /boot and the install then worked.

Regarding RAID, yes I realise it's easy to do post-fact, in fact on the
same test system I added an external USB2 drive to the root filesystem
and rebalanced as RAID-1, worked nicely.

I'm planning on adding dual SSDs as my OS disks to my desktop and this
experiment was to learn whether the Kubuntu installer handled it yet and
if not to do a quick practice of setting it up by hand. :-)

All the best,
Chris
--
Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC