[arch-general] can't balance full btrfs raid6 filesystem

Leonid Isaev leonid.isaev at jila.colorado.edu
Mon Feb 22 18:43:01 UTC 2016

On Mon, Feb 22, 2016 at 05:41:18PM +0000, Jameson wrote:
> On Mon, Feb 22, 2016 at 11:28 AM Garmine 42 <mikro001 at gmail.com> wrote:
> > You should not use quotas on btrfs currently. It is known to cause
> > significant performance issues on the long run (and potentially has
> > many undiscovered bugs). If you wish I can dig up the relevant
> > discussion on the btrfs mailing list for you.
> >

Yes, I heard this but can't find relevant bugreports. The kernel wiki says that
quotas are fully supported, at least with simplest (raid1?) setups.

> Well, without quotas, I can just expect my filesystem to fill up, again,
> without warning, and completely break. I think I might just have to buy
> some extra disks, and try out ZFS for myself.

See this:

Basically, when your btrfs is full, just create a loopback device, add it to
the array, rebalance and then remove the device. This is what I had to do this
Sunday :)

Leonid Isaev
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