Re: [LSF/MM/BPF BoF] BoF for Zoned Storage

Luis Chamberlain
2022-03-11T20:31:42Z

On Thu, Mar 10, 2022 at 10:07:30PM -0800, Christoph Hellwig wrote:
> On Thu, Mar 10, 2022 at 04:49:06PM -0800, Luis Chamberlain wrote:
> > Some filesystems who want to support zone storage natively have been
> > extended to do things to help with these quirks. My concerns were the
> > divergence on approaches to how filesystems use ZNS as well. Do you have
> > any plans to consider such efforts for XFS or would you rather build on
> > ZoneFS somehow?
>
> XFS will always require a random writable area for metadata.

XFS also supports an external journal, so could that go through
a conventional zone?

> I have
> an old early draft with a fully zone aware allocator essentially
> replacing the realtime subvolume. But it's been catching dust so far,
> maybe I'll have a chance to resurrect it if I don't have too fight too
> many stupid patchseries all at once.

Good to know thanks!

I was wondering weather or not Chinner's subvolume concept could be
applied to ZoneFS for the data area. But given the file would be on
another filesystem made me think this would probably not be possible.
Then there is the append only requirement as well...

Luis