This is the same company that declared s3 has 11 9s of annual durability. They might have enough objects that they can verify that number now. In the ebs outag

This is the same company that declared s3 has 11 9s of annual durability. They might have enough objects that they can verify that number now. In the ebs outage of 2011, volumes were unable to remirror after losing 1 mirror. That increased the probability of losing both mirrors, possibly reducing the durability below the designed rate. I.e. the designed rate assumes everything is working as designed.