mirror.chpc.utah.edu now carries both the altarch tree and the vault. Feel free to pull it from me. Here are the URLs:

# CentOS main content http://mirror.chpc.utah.edu/pub/centos rsync://mirror.chpc.utah.edu/pub/centos rsync://mirror.chpc.utah.edu/CentOS (deprecated URL)

# Alt-arch http://mirror.chpc.utah.edu/pub/centos-altarch rsync://mirror.chpc.utah.edu/pub/centos-altarch

# Vault http://mirror.chpc.utah.edu/pub/vault.centos.org rsync://mirror.chpc.utah.edu/pub/vault.centos.org

Thanks, DR