Re: [LSF/MM TOPIC] end-to-end data and metadata corruption detection

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On Tue, Jan 31, 2012 at 11:22 AM, Bernd Schubert
<bernd.schubert@xxxxxxxxxxxxxxxxxx> wrote:
> I guess we should talk to developers of other parallel file systems and see
> what they think about it. I think cephfs already uses data integrity
> provided by btrfs, although I'm not entirely sure and need to check the
> code. As I said before, Lustre does network checksums already and *might* be
> interested.

Actually, right now Ceph doesn't check btrfs' data integrity
information, but since Ceph doesn't have any data-at-rest integrity
verification it relies on btrfs if you want that. Integrating
integrity verification throughout the system is on our long-term to-do
list.
We too will be said if using a kernel-level integrity system requires
using DIO, although we could probably work out a way to do
"translation" between our own integrity checksums and the
btrfs-generated ones if we have to (thanks to replication).
-Greg
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