Re: [PATCH V4 11/16] block: mq-deadline: Introduce zones_wlock attribute

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On 9/24/17 17:19, Christoph Hellwig wrote:
> On Sun, Sep 24, 2017 at 04:02:42PM +0900, Damien Le Moal wrote:
>> Zone write locking is mandatory for host managed zoned block devices so
>> that sequential write order can be maintained. This is however optional
>> for host aware devices as the device firmware can handle random writes.
>>
>> The default initialization always enable zones write locking for any
>> zoned block device. Introduce the zones_wlock sysfs attribute to allow
>> users to change this default setting for host aware disks. Changes to
>> zones write locking state are not allowed for host managed disks (zones
>> write locking is always enabled) and for regular disks (zones write
>> locking is always disabled).
> 
> Is it really worth the effort?  Until someone who really ares about
> HA drives and shows a benefit for a workload that matters I'd just
> leave to code off for HA.

OK. Will do. That can be changed back later again easily enough.

Thanks.

-- 
Damien Le Moal
Western Digital Research



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