Martin K. Petersen wrote:
> We're very concerned about data integrity. With btrfs everything is
> checksummed at the logical level. This allows you to detect data
> corruption, repair bad blocks using redundant, good copies, perform
> data scrubbing, etc.
That's the main reason I am interesting in btrfs, actually. :)
> A related, but orthogonal data integrity measure is the T10 DIF
> infrastructure that I am working on. DIF enables protection at the
> sector level and includes stuff like a data checksum and a locality
> check which ensures that the sector ends up the right place on disk.
Great! Really great to hear that this issue is being actively worked.
> Right now the DIF checksum is added at the block layer level. Work is
> in progress to move it up into the filesystems and from there into
> user space. Eventually we'd like to be able to generate the checksum
> in the application and pass it along the I/O path all the way out to
> the physical disk.
Yep, end-to-end is a great idea. Kudos to this and to btrfs!
-Joe
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