Re: btrfs and ECC RAM

Chris Murphy
2014-01-25T00:45:08Z

On Jan 20, 2014, at 9:08 AM, George Mitchell <george@chinilu.com> wrote:

> After reading the recent posts on this topic I am beginning to think there is some real confusion between "check sums" and "parity".

Yes, I often see conventional raid6 assumed to always be capable of detecting and correcting corruption, not merely the ability to rebuild missing data of known location and length in a stripe (known either due to the drive reporting read error along with LBA; or a physical device becoming unavailable or unresponsive).

> But I CAN see how bad RAM could affect parity calculations and resulting data IN THE ABSENCE of protective checksums and cannot help but wonder if THAT is what the original article is describing.

Does Btrfs (and I'd presume ZFS) raid5/6 checksum both data and parity chunks? And in the case of raid6 are the two parities separately checksummed?

Chris Murphy