On Tue, Dec 17, 2024 at 12:41:50PM -0700, Jens Axboe wrote: > As per earlier replies, it's either -EAGAIN being mishandled, OR it's > driving more IOs than the device supports. For the latter case, io_uring > will NOT block, but libaio will. And that's exactly the case here as zoned devices only support a single I/O to a zone and will have to block for the next one. > Like Christoph alluded to in his first reply, driving more than 1 > request inflight is going to be trouble, potentially. If you rely on order. If you are doing O_APPEND-style I/O on zonefs or using a real file systems it's perfectly fine.
