Update 2: The drives could not be recovered. New drives are being installed. Once that's done the websites will be restored from a backup.
Update: The data tech is attempting to repair the drive. There is a small chance of data loss but this is the best option without completely wiping the drive and restoring from a backup.
The host 7 server has crashed with what appears to be a RAID error. The datacenter is investigating now. If you need your site up right away I can manually move you to a different server. Very large sites will take some time to migrate.