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Forum Discussion
Confused about the scrubbing function and bit rot protection feature
From reading ReadyNAS OS 6: An overview of relevant scheduled maintenance tasks available I'm a little confused about the following section: Should I use scrubbing regularly? Scrubbing is closel...
Maybe this will help: /Bit-rot-Protection-and-Copy-on-Write-COW-in-depth
Netgear has intimately linked bit rot protection and CoW. You cannot have CoW without bit rot protection. So if bit rot protection (and, consequenctly CoW) are disabled, you have no checksums a BTRFS scrub can use to detect and correct errors. So, scubs are basically useless.
Thanks for your replies.
If scrubs are useless then why does it allow you to start one without a warning if you don't have bit rot protection enabled and why did the one I ran a few days ago take 15 hours to complete? What was it doing in all that time?
I will double check my shares, perhaps bit rot / CoW is enabled on one or more of them though it's not something I recall ever enabling unless it is done by default.
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