During our established maintenance window between 6 am and 10 am Sunday morning we will be upgrading two services, the Central Authentication Service (CAS) that is used to login to many Middlebury and MIIS web applications and Papercut used to track printing.
We will not be making any network infrastructure related changes this Sunday, the interim network core solution in place is working well and we are continuing to work with our vendors to isolate instability problems with new gear that is part of our network core upgrade, we will announce any planned network service interruption in advance.
Beginning at approximately 7:00 am we will start the papercut upgrade to version 12.3 that includes upgrades to our primary papercut server but also a number of secondary print servers including: Willow, Spruce, Bombay, Aspen, Beech and Walnut. The entire upgrade process is estimated to take 1.5 hours however the actual service interruption will be less than 10 minutes for any individual server. When a particular server is off-line, printing jobs will be queued up and resubmitted once the server is backup. There will also be a less than 10 minute outage of web print services during this window.
Beginning at approximately 8:00 am we will be upgrading CAS with new servers configured as an high availability (HA) pair, we do not expect a notable interruption of the web application authentication service as we will be redirecting incoming requests to the new servers while keeping the current ones functional, it is possible that one may be asked to login a second time when authenticating to another web application for as long as 10 minutes during the actual upgrade. CAS is used to log in to many Middlebury and MIIS web applications include the primary college web sites, the course hub, Moodle and sites.middlebury.edu.
We appreciate your patience as we upgrade our systems.