On 08/18/2017 01:39 AM, Josef Bacik wrote: [...] > This is happening because the app (the guest OS in this case, we saw this a lot > with windows guests) is changing the pages while they are in flight. We > calculate the checksum of the page before it's written, so if it changes while > in flight we'll end up with a csum mismatch. > > To fix this change kvm to not use O_DIRECT or set NODATASUM on your qcow2 image. > You'll have to re-create the image because NODATASUM won't apply to the already > invalid checksums. Thanks, Hi Josef, could you elaborate: do you are saying that using O_DIRECT is incompatible with DATASUM ? Let me know BR G.Baroncelli > > Josef > -- > 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 > -- gpg @keyserver.linux.it: Goffredo Baroncelli <kreijackATinwind.it> Key fingerprint BBF5 1610 0B64 DAC6 5F7D 17B2 0EDA 9B37 8B82 E0B5 -- 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
