Re: [PATCH 0/6] power_of_2 emulation support for NVMe ZNS devices

Christoph Hellwig
2022-03-14T07:42:26Z

On Thu, Mar 10, 2022 at 05:38:35PM +0000, Adam Manzanares wrote:
> > Do these drives even support Zone Append?
>
> Should it matter if the drives support append? SMR drives do not support append
> and they are considered zone block devices. Append seems to be an optimization
> for users that want higher concurrency per zone. One can also build concurrency
> by leveraging multiple zones simultaneously as well.

Not supporting it natively for SMR is a major pain. Due to hard drives
being relatively slow the emulation is somewhat workable, but on SSDs
the serialization would completely kill performance.