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3 years ago
If you're not periodically checking the data for corruption, and only moving from a single drive to a replacement single drive, eventually you'll have some corrupted data which gets copied from drive to drive without you noticing.
4 TB drives are dirt cheap. If someone would really be "lost" without this data, having some redundancy would be inexpensive and easy.
If stored on ZFS, at least it would be validated each time it was copied.
Also, run zpool scrub regularly to detect and repair any corruption early.
If you keep a ZFS mirror of the most-recent N drives, and store them separately, that should be pretty good.
I forget how ZFS behaves if a mirror is missing drives though, if some are off-site. Hopefully it's smart enough to let you do that and just rotate through.
ZFS doesn’t handle that well generally.
You’d have better luck making a full (manual) copy most likely (ZFS send/recv, or mirror then un-mirror even better), assuming you’d run a scrub after.
Or manually make checksum files I guess. I’ve done that, less ‘magic’ that way.
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If you offline or detach the drive, it should be fine afaik. Detach is probably the better way to go though, because it removes the drive from the status listing.
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