Re: [LSF/MM/BPF TOPIC] Hybrid SMR HDDs / Zone Domains & Realms

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On 3/2/23 08:50, Bart Van Assche wrote:
> On 3/1/23 15:34, Khazhy Kumykov wrote:
>>   - There’s already support in the kernel for marking zones
>> online/offline and cmr/smr, but this is fixed, not dynamic. Would
>> there be hiccups with allowing zones to come online/offline while
>> running?
> 
> It may be easier to convince HDD vendors to modify their firmware such 
> that the conventional and SMR zones are reported to the Linux kernel as 
> different logical units rather than adding domains & realms support in 
> the Linux kernel. If anyone else has another opinion, feel free to share 
> that opinion.

That would not resolve the fact that each unit would still potentially have a
mix of active and inactive areas. Total nightmare to deal with unless a zone API
is also exposed for any user to figure out which zone is active.
That means that we would need to always expose these drives as zoned, using a
very weird zone model as zone domains/zone realms do not fit at all with the
current host-managed model. Lots of places need changes to handle these drives.
This will make things very messy all over.

> 
> Whether or not others agree with my opinion, I think this is a good 
> topic for LSF/MM.
> 
> Thanks,
> 
> Bart.
> 

-- 
Damien Le Moal
Western Digital Research





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