error handling for cluster/replicate across 2 or more nodes

[byhisdeeds at gmail.com (John Preston)]

I am setting up a gluster configuration to replicate data across 3 nodes
using:

volume afr-volume
  type cluster/replicate
  subvolumes brick1 brick2 brick3
end-volume

Can someone say what safeguards exist with such a configuration to ensure
that if one of the nodes disks, starts to go bad and thus introduce errors
in one or more of the copies of files, that these bad sectors don't get
replicated across the cluster.

John