Re: moving a subvol

[Gene Czarcinski <gczarcinski@gmail.com>]

On 12/14/2013 02:07 AM, Chris Samuel wrote:
> On Fri, 13 Dec 2013 02:25:34 PM Gene Czarcinski wrote:
>
>> Next it is to delete the old BTRFS volume, use fdisk to increase the
>> size of the partition and then attempt to increate the size of this new
>> volume.  I hope I don't get bit in the rear end with this.
>
> Just make sure you have good (tested) backups..
>
Data subvolumes such as for /home have separate backups but the rootfs 
subvolumes do not.  If somethings gets screwed up, it is a matter of 
reinstalling.  Since I run Fedora with anaconda I use kickstart installs 
and can easily repeat an install since it included almost everything I 
want installed.  And then I have a post-install script I run to pickup 
additional stuff.

After successfully resizing, I then repeated with a two-device BTRFS 
volume.  Here the resize needs to be done for each device.

Question:  What is did involved two BTRFS volumes on /dev/sdb1 and 
/dev/sdb2.  I deleted /dev/sdb2 and then expanded/resized /dev/sdb1. 
This worked but I assume that doing the opposite would not work.  That 
is, deleteing the "lower" /dev/sdb1 and then expanding the "upper" 
/dev/sdb2 because after rebooting the filesystem would not be at the 
beginning of the partition.

Gene