this post was submitted on 14 Jul 2025
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Assuming you aren't striping, up to 36 TB. If you follow even halfway decent practices with basically any kind of RAID other than 0, hopefully 0 Bytes.
The main worry with stuff like this is that it potentially takes a while to recover from a failed drive even if you catch it in time (alert systems are your friend). And 36 TB is a LOT of data to work through and recover which means a LOT of stress on the remaining drives for a few days.
It would probably take days to rebuild the array.
It's important to also note that RAID (or alternatives such as unRAID) are not backup systems and should not be relied on as such. If you have a severe brownout that fries more than two or three drives at once, for example, you will lose data if you're not backing up.