Checksumming blocks? [was Re: the " 'official' point of view" expressedby kernelnewbies.org regarding reiser4 inclusion]

[Russell Leighton]

If the software (filesystem like ZFS or database like Berkeley DB)  
finds a mismatch for a checksum on a block read, then what?

Is there a recovery mechanism, or do you just be happy you know there is 
a problem (and go to backup)?

Thx

Matthias Andree wrote:

> Berkeley DB can, since version 4.1 (IIRC), write checksums (newer
> versions document this as SHA1) on its database pages, to detect
> corruptions and writes that were supposed to be atomic but failed
> (because you cannot write 4K or 16K atomically on a disk drive).

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