On 2018-08-02 03:07 AM, Qu Wenruo wrote: > For data, since we have cow (along with csum), it should be no problem > to recover. > > And since datacow is used, transaction on each device should be atomic, > thus we should be able to handle one-time device out-of-sync case. > (For multiple out-of-sync events, we don't have any good way though). > > Or did I miss something from previous discussion? As far as I know, that is indeed correct and works very well. The question was specifically about using nodatacow for databases,, and that's the question I was responding too. In the current state, I do no believe btrfs nodatacow is in any way appropriate for databases/vm hosting when combined with multi-device.
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