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I went ~2 years without running a scrub when I first started using ZFS many years ago; when I ran my first scrub, it found 2 file corruptions, one in a random p
by saalweachter 7y ago
I went ~2 years without running a scrub when I first started using ZFS many years ago; when I ran my first scrub, it found 2 file corruptions, one in a random picture back when I still copied pictures from a digital camera to a hard drive, one in a random file in the browser cache.
(If I'd been scrubbing regularly, these almost certain would have been found before corruption crept into the mirrored copy of the file, and been recoverable.)
- cmurf 7y agoThis is a great point about how pernicious corruption is: it replicates. Detection is more important than correction, at least you can stop the corruption from spreading. It's typical for people to reuse storage hardware, and each derivative inherits prior corruption as well as contributing its own. Most people don't keep a long term unchanging archive, and even that archive likely has no means of unambiguous verification of data integrity.
- saalweachter 7y agoTo be honest I'm not sure if the corruption was replicated directly, or if it's just that the same file got unlucky on two different drives -- I can't recall if this was before or after a drive failure.