On Thu, Jun 23, 2016 at 1:32 PM, Goffredo Baroncelli <kreijack@xxxxxxxxx> wrote: > > The raid5 write hole is avoided in BTRFS (and in ZFS) thanks to the checksum. Yeah I'm kinda confused on this point. https://btrfs.wiki.kernel.org/index.php/RAID56 It says there is a write hole for Btrfs. But defines it in terms of parity possibly being stale after a crash. I think the term comes not from merely parity being wrong but parity being wrong *and* then being used to wrongly reconstruct data because it's blindly trusted. I don't read code well enough, but I'd be surprised if Btrfs reconstructs from parity and doesn't then check the resulting reconstructed data to its EXTENT_CSUM. -- Chris Murphy -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
