Re: Array extremely unbalanced after convert to Raid5

[Zygo Blaxell <ce3g8jdj@umail.furryterror.org>]

On Wed, May 05, 2021 at 09:58:03AM -0400, remi@georgianit.com wrote:
> 
> 
> On Wed, May 5, 2021, at 9:41 AM, Abdulla Bubshait wrote:
> > I ran a balance convert of my data single setup to raid 5. Once
> > complete the setup is extremely unbalanced and doesn't even make sense
> > as a raid 5. I tried to run a balance with dlimit of 1000, but it just
> > seems to make things worse.
> 
> > 
> > Unallocated:
> >   /dev/sdd       14.12TiB
> >   /dev/sdc      404.99GiB
> >   /dev/sdf        1.00MiB
> >   /dev/sde        1.00MiB
> > 
> > 
> 
> 
> Sorry, I don't have a solution for you, but I want to point out that
> the situation is far more critical than you seem to have realized.. this
> filesystem is now completely wedged, and I would suggest adding another
> device, or replacing either /dev/sdf  or /dev/sde with something
> larger,, (though, if those are real disks, I see that might be a
> challenge.)
> 
> Your metadata is Raid1C3, (meaning 3 copies,), but you only have 2 disks
> with free space.  And thanks to the recent balancing, there is very
> little free space in the already allocated metadata,, so effectively,
> the filesystem can no longer write any new metadata and will very
> quickly hit out of space errors.

The situation isn't that dire.  Balancing one data chunk off of either
/dev/sdf or /dev/sde will resolve the issue.