[PATCHv10 0/9] write hints with nvme fdp, scsi streams

[hch]

On Tue, Dec 10, 2024 at 08:05:31AM +0000, Johannes Thumshirn wrote:
> > Generally agreeing with all you said, but do we actually have any
> > serious use case for cross-LU copies?  They just seem incredibly
> > complex any not all that useful.
> 
> One use case I can think of is (again) btrfs balance (GC, convert, etc) 
> on a multi drive filesystem. BUT this use case is something that can 
> just use the fallback read-write path as it is doing now.

Who uses multi-device file systems on multiple LUs of the same SCSI
target ơr multiple namespaces on the same nvme subsystem?