For us, I/O isn't as big a cost factor, since our data processing mostly resides in ephemeral storage where I/O charges don't apply. (Our permanent data backups

For us, I/O isn't as big a cost factor, since our data processing mostly resides in ephemeral storage where I/O charges don't apply. (Our permanent data backups live in S3.) I/O pricing does apply when using EBS.