On 2019/7/26 上午2:37, David Sterba wrote: > On Thu, Jul 18, 2019 at 02:27:49PM +0800, Qu Wenruo wrote: >> RAID10 can accept as much as half of its disks to be missing, as long as >> each sub stripe still has a good mirror. > > Can you please make a test case for that? Fstests one or btrfs-progs one? > > I think the number of devices that can be lost can be higher than a half > in some extreme cases: one device has copies of all stripes, 2nd copy > can be scattered randomly on the other devices, but that's highly > unlikely to happen. > > On average it's same as raid1, but the more exact check can potentially > utilize the stripe layout. > That will be at extent level, to me it's an internal level violation, far from what we want to improve. So not that worthy. Thanks, Qu
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