> Checksumming is essential to having a rebuild process that actually works. With mdadm when you rebuild you will probably get silent corrupt data in a couple o

> Checksumming is essential to having a rebuild process that actually works. With mdadm when you rebuild you will probably get silent corrupt data in a couple of files because anything that went bad since your last scrub (if your scrub setup is even working) will not be detectable. I can confirm, it happened to me. A disk was corrupting my files and mdadm had no problem propagating the errors. Later switched to ZFS, and checksum error happen (defective SATA cable IIRC). By the way, the author suggests ECC RAM "if you are paranoid", good suggestion, it goes particularly well with ZFS checksumming, and I experienced faulty RAM too. I switched to ZFS because I actually lost data with a mdadm/ext4 system, I didn't lose data with ZFS even though I went through broken hardware.