> > To do checksumming (and in particular, recovery), requires higher > > level > > knowledge of the data. The filesystem can track when it writes a > > file, > > and update metadata (including, if desired, a data checksum) once it > > knows the file is correctly stored. But I don't think it can > > sensibly > > be done at the block device level - the recovery procedure doesn't > > know > > what is old data, what is new data, or which bit is important to the > > filesystem. > > > > So I think it can make sense to use a filesystem like ZFS or BTRFS > > that > > can do checksumming - that is a reasonable level to add the > > checksum. > > You'll see CRC in XFS in the future as well. Some of the foundation is > already laid to allow it, but IIRC it requires an on disk format > change > for full implementation. On disk format changes are a big deal and are > taken with great care. IIRC XFS has only seen one or two in 18 years. I'm afraid that won't help much either, since it'll only allow for *detecting* the errors, and not *fixing* them (as with ZFS and Btrfs). Or perhaps if XFS can integrate with MD somehow? Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 98013356 roy@xxxxxxxxxxxxx http://blogg.karlsbakk.net/ GPG Public key: http://karlsbakk.net/roysigurdkarlsbakk.pubkey.txt -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med xenotyp etymologi. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
