[mythtv-users] Manage recording storage group with btrfs subvolume

[James Linder]

> On 10 Jan 2021, at 6:06 pm, Mike Perkins <mikep at randomtraveller.org.uk> wrote:
> 
> On 10/01/2021 02:27, Richard Shaw wrote:
>> I'm looking at moving to a 4 drive raid1 array (and perhaps converting to
>> raid5 later) btrfs array. Most of the space will be used for media but I
>> want to keep 1TB for recordings.
>> The problem is that btrfs will share free space among subvolumes by default
>> and I don't know if there is  a quota method that will limit free space
>> reporting so that the backend will expire recordings properly like on a
>> dedicated filesystem.
>> Anyone else run into this and have a solution?
> I run my "raid" volumes under LVM. That way I can allocate discrete volumes[1] to each function and the free space is not shared between them.
> 
> [1] Each volume can them be formatted a different way as required.

Richard why would you not partiton your disks *exactly* as you want, rather than what your vendor (suse ??) decided what was good for most people. When I looked I decided that btrfs was not what I wanted on my myth server

James