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

Richard Shaw hobbes1069 at gmail.com
Sun Jan 10 22:55:12 UTC 2021

On Sun, Jan 10, 2021 at 5:22 AM James Linder <jam at tigger.ws> wrote:

> > 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

I've used LVM for over a decade, and while it works, every time I need to
replace a disk live I have to go back to the documentation and deal with
the three levels in the right order to make the magic happen. pv... vg...

Btrfs still has a few issues but it's gotten pretty stable so I'd like to
play around with it. My recordings are not critical. And I can do things
like change between raid1 and raid5 at will, live. And lots of other
interesting features.

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