ocfs2: Add metadata ECC - almost there.
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Cover letter [Ocfs2-devel] [PATCH 0/18] ocfs2: Add metadata ECC - almost there.
Quoted 8 lines · Andi Kleen
Quoted 5 lines · Joel Becker
These patches add the metadata ECC code to ocfs2. They have one limitation - they do not ECC directory blocks yet. However, that will only take a simple insertion of the dirblock trailer. With xattr ECC completed, the patches are approaching a final form and are ready for initial review. They are atop my xattr-buckets-2 branch.
Quoted 5 lines
Could you please expand a bit why you chose ECC over more standard CRCs?
My assumption would be normally that if there is disk corruption it won't be single flipped bits, but more large scale corruption. Do you have data/experiences on the contrary?
If you look at our block_check structure, you'll see that it
uses crc32c for the overall block, and then the ECC can attempt to correct a single bit if the crc fails.
Joel
Signature · 9 lines
"If the human brain were so simple we could understand it, we would be so simple that we could not." - W. A. Clouston Joel Becker Principal Software Developer Oracle E-mail: joel.becker at oracle.com Phone: (650) 506-8127