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Cake day: February 17th, 2024

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  • RAID is more likely to fail than a single disk. You have the chance of single-disk failure, multiplied by the number of disks, plus the chance of controller failure.

    This is poorly phrased. A raid with a bad disk is not failed, it is degraded. The entire array is not more likely to fail than a single disk.

    Yes, you are more likely to experience a disk failure, but like you said, only because you have more disks in the first place. (However, there is also the phenomenon where, after replacing a failed disk, the additional load during the rebuild might cause a second disk to fail, which is why you should replace failed disks as soon as possible. And have backups.)