Here is the promised config file. In this example I am using a single
disk with two different partitions one containing btrfs and the other
ext4 and with / in btrfs and /home in ext4:
disk_config disk1
primary /home 50% ext4 defaults
primary - 50% - -
disk_config btrfs
btrfs raid1 / disk1.2 noatime,subvol=@/
The raid1 is in this case redundant, because btrfs uses raid1 for data
and metadata by default (irrc that's true even for single disk
configurations, because you can always add a disk later and it kinda
needs to know how to handle it). However, we decided to make that part
mandatory.
Also note the "subvol=@/" , setup-storage will not create your / in the
root of the filesystem but actually create a subvolume for it. It will
be added to your fstab accordingly.
So that's it. You first define your partitions and the "classical"
filesystems in the "disk_config disk*" and then in disk_config btrfs
part, you define all btrfs raids/partitions. If you want both / and
/home in a subvolume each and each of them in their own paritions, then do:
disk_config disk1
primary - 50% - -
primary - 50% - -
disk_config btrfs
btrfs raid1 / disk1.2 noatime,subvol=@/
btrfs raid1 /home disk1.1 subvol=@/home
Best regards
Kerim
On 15.01.2015 15:51, Urs Ganse wrote:
Dear FAI people,
I have a question about the recently added btrfs support, which is not
exactly clear to me from the existing documentation:
I am installing systems with a single disk, of which one partition is
supposed to contain a btrfs file system.
To make updating easier, I'd like to have multiple subvolumes in that
filesystem, especially I'd like to have the system root in a non-/
default subvolume (so that later on, I can snapshot that subvolume to
perform easily-rollback-able upgrades).
How do I specify such a configuration in the setup-storage config? The
documentation only gives an example for btrfs lines with subvolumes
that use raid configurations, but are not exactly clear about how to
specify multiple subvolumes in the same partition. Also, is there a
way to specify the default subvolume here?
The formal config file syntax description is missing any mention of
the btrfs lines, too.
Cheers,
//Urs
