The system that the web-facing part of VLP runs in will be undergoing some maintenance this weekend. This means that the VLP Web End User Interface (EUI) only will be down for an hour, from 0900 - 1000 CDT on May 31rst. Users will still have access to their reserved systems, since these are not going to be taken down. Also, any reservation that was scheduled to start during this time will start normally.
When we plan downtime, we post a message on the VLP 'Reservation Management' tab. You have to log in to VLP to see these messages, which are rather terse. You can always consult this blog for more details.