Re: RAID56 discussion related to RST. (Was "Re: [RFC ONLY 0/8] btrfs: introduce raid-stripe-tree")

Goffredo Baroncelli
2022-07-17T17:58:21Z

On 16/07/2022 16.26, Goffredo Baroncelli wrote:
> On 16/07/2022 15.52, Thiago Ramon wrote:
>>> Good luck implementing that feature just for RAID56 on non-zoned devices.
>> DIO definitely would be a problem this way. As you mention, a separate
>> zone for high;y modified data would make things a lot easier (maybe a
>> RAID1Cx zone), but that definitely would be a huge change on the way
>> things are handled.
>
>
> When you talk about DIO, do you mean O_DIRECT ? Because this is full reliable
> even without RAID56...
ehmm... I forgot a "not". So my last sentence is

Because this is NOT fully reliable even without RAID56...

> See my email
>
> "BUG: BTRFS and O_DIRECT could lead to wrong checksum and wrong data", sent 15/09/2017
>
>
>

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