On 01/17/2012 09:15 PM, Chuck Lever wrote:
Hi- I know there is some work on ext4 regarding metadata corruption detection; btrfs also has some corruption detection facilities. The IETF NFS working group is considering the addition of corruption detection to the next NFSv4 minor version. T10 has introduced DIF/DIX. I'm probably ignorant of the current state of implementation in Linux, but I'm interested in understanding common ground among local file systems, block storage, and network file systems. Example questions include: Do we need standardized APIs for block device corruption detection? How much of T10 DIF/DIX should NFS support? What are the drivers for this feature (broad use cases)?
Other network file systems such as Lustre already use their own network data checksums. As far as I know Lustre plans (planned?) to use underlying ZFS checksums also for network transfers, so real client-to-disk (end-to-end) checksums. Using T10 DIF/DIX might be on their todo list.
We from the Fraunhofer FhGFS team would like to also see the T10 DIF/DIX API exposed to user space, so that we could make use of it for our FhGFS file system. And I think this feature is not only useful for file systems, but in general, scientific applications, databases, etc also would benefit from insurance of data integrity.
Cheers, Bernd -- Bernd Schubert Fraunhofer ITWM -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
