have you ever successfully broken the zfs to the point where it's not recoverable?

a screenshot of an email message with output of zpool scrub command, showing data corruption and 'restore the entire pool from backup' as one of the suggested solutions
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I've seen a calculation somewhere for drive speed, size and scrub frequency where optimal number of extra drives was calculated. On fast storage and with weekly scrubs one extra drive should be mostly fine.

My philosophy is any raid is not really a data contingency solution - it just saves some time when the drive fails.

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