Does RAID 1 of 3 HDD offer any protection against bitflip on 1 of drives
Theoretically if 3 HDD are set up in RAID 1 - meaning every disk has same content and bit flip happens to the bit on one of them 2 other disks can be used to "vote" which value of bit being read should be "chosen as correct one by majority of votes". Does RAID 1 of 3 HDD make use of that fact in any way?
Of course bit flips can happen for same bit on 2 HDD at the same time but such cases potentially could be very very rare.
👤 WantonQuantum Accepted Answer ✓
No, in a RAID 1 configuration (of any number of drives) writes are written to all drives and each read comes from only 1 drive.
Depending on the implementation, reads can be spread across drives but no parity is checked.