Re: /boot as a btrfs subvolume

[Gene Czarcinski <gene@czarc.net>]

On 01/05/2013 04:32 PM, Chris Murphy wrote:
> On Jan 5, 2013, at 2:17 PM, Gene Czarcinski <gene@czarc.net> wrote:
>
>> As of the latest updates to anaconda and grub2 for Fedora 18, it is now possible to install with /boot as a btrfs subvolume.  The way that grub2 is handling this is the "reach down" to the files it needs as if the subvolume was a directory.
> Also for what it's worth, it also works for multiple device Btrfs volumes, all profiles supported by GRUB2. For me GRUB fails to navigate Btrfs for RAID0 if there are 5+ devices. Single still works, oddly RAID10 still works. So some regression is needed to figure out what's going on there. May be a bug, but honestly it's still pretty cool.
>
> Also to test is if installing grub to each device, in a multiple device raid1 or raid10 volume, still allows it to be bootable with any one device removed from the volume. I think it'll work.
>
There is also issues with btrfs and os-prober for multiboot ... it does 
not currently work.  I hacked up a patch to get it to work but have 
since had second thoughts about how multiboot should be handled.  I now 
prefer a separate grub partition, os-prober disabled, and a grub.cfg 
file which points to the grub.cfg for each individual system.

BTW, although you can install and boot boot installed in a logical 
volume, that system is not supported in os-prober multiboot.

Gene