>raid 1 write data on all disks synchronously all time, no tricks.
>btrfs raid1 read data by PID%2
>0 - first copy
>1 - second copy

Meaning, a single-process database will only ever read one copy? At least, 
meaning of first/second relative to physical devices depends on extent, right, 
right?
-- 

With Best Regards,
Marat Khalili
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