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Should I bother with raid
(lemmy.world)
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this post was submitted on 02 Dec 2024
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Depends, how much do you value your data? Is it all DVD rips where you still have the DVDs? Nah you don't really need raid. Are they precious family photos where your only backup copy is S3? Yeah I'd use raid for that, plus having a second copy stored elsewhere.
Plus as others have mentioned there's checks on your data for bitrot, which absolutely does happen.
RAID does not protect your data, it protects data uptime.
RAID cannot ensure integrity (i.e bitrot protection). Its one and only purpose it to mitigate downtime.
ZFS or other software RAIDs can though. Does anyone stll use hardware raid anyways?
ZFS and BTRFS' integrity checks are entirely independent of whether you have redundancy or not. You don't need any sort of RAID to get that; it also works on a single disk.
The only thing that redundancy provides you here is immediate automatic repair if corruption is found. I've written about why that isn't as great as it sounds in another reply already.
Most other software RAID can not and does not protect integrity. It couldn't; there's no hashing. Data verification is extremely annoying to implement on the block level and has massive performance gotchas, so you wouldn't want that even if you could have it.