Re: [PATCH 0/2] New zoned loop block device driver

[Ming Lei <ming.lei@redhat.com>]

On Wed, Jan 08, 2025 at 10:09:12AM +0100, Christoph Hellwig wrote:
> On Wed, Jan 08, 2025 at 04:13:01PM +0800, Ming Lei wrote:
> > It is backed by virtual memory, which can be big enough because of swap, and
> 
> Good luck getting half way decent performance out of swapping for a 50TB
> data set.  Or even a partially filled one which really is the use case
> here so it might only be a TB or so.
> 
> > it is also easy to extend to file backed support since zloop doesn't store
> > zone meta data, which is similar to ram backed zoned actually.
> 
> No, zloop does store write point in the file sizse of each zone.  That's
> sorta the whole point becauce it enables things like mount and even
> power fail testing.
> 
> All of this is mentioned explicitly in the commit logs, documentation and
> code comments, so claiming something else here feels a bit uninformed.

OK, looks one smart idea.

It is easy to extend rublk/zoned in this way with io_uring io emulation, :-)



Thanks,
Ming