The https://dumps.wikimedia.org web interface for downloading various dump files is currently offline. The rsync service for external mirroring is as well. Local network NFS consumers may or may not be working depending on which server the consumer is attached to.
This unexpected outage is the result of hardware issues following a short planned maintenance. We are currently investigating the root cause of the outage and will post additional updates as they become available. Thanks for your patience.
Bryan