07-Jul-2025

CLASSE Computing Outages: 12-Jul-2025 to 22-Jul-2025

From Saturday, 12-Jul-2025, to Tuesday, 22-Jul-2025, CLASSE computing services both onsite and offsite will be disrupted by a series of scheduled power outages due to electrical maintenance at Wilson Lab. Please note that, although Wilson Lab will regain power on Sunday, 20-Jul-2025, we do not expect to have most CLASSE-IT services restored until Tuesday, 22-Jul-2025. Additional recovery efforts might extend farther into the week.

This schedule may shift on short notice in case of inclement weather that makes it unsafe to perform the electrical maintenance. Any schedule adjustments will be communicated via the CLASSE-IT-NEWS-L mailing list -- please subscribe to receive urgent announcements from CLASSE-IT.

Below is a summary timeline, along with recommended actions for users and status of Compute Farm queues:

Day	Time	Action	Compute Farm Availability
Sat 12-Jul	8:00 AM	Compute Farm batch queues disabled	Interactive and CHESS queues only
Mon 14-Jul	By 12:00 noon	Please save your work and log out	All queues down
Mon 14-Jul	1:00 PM	CLASSE-IT services unavailable
Mon 14-Jul	5:00 PM	Most CLASSE services restored; reboot your computer if necessary	Interactive and CHESS queues only (reduced capacity)
Fri 18-Jul	By 5:30 AM	Please save your work and log out	All queues down
Fri 18-Jul	5:30 AM	CLASSE-IT services unavailable
Fri 18-Jul	6:30 AM	Wilson Lab main building power cut
Sun 20-Jul	Afternoon	Wilson Lab power restored
Sun 20-Jul	Late night	CESR/CHESS control systems restored
Tue 22-Jul	8:00 AM	Most CLASSE services restored; reboot your computer if necessary	All queues available

Service availability during the power outages

Please note that this table has been updated since last week's Newsletter

On Monday, 14-Jul-2025, 1:00-5:00 PM and from Friday, 18-Jul-2025, 5:30 AM to Tuesday, 22-Jul-2025, 8:00 AM, computing services in each building will be affected as follows:

		Wilson Lab and Modules (18-Jul to 20-Jul)	Newman Lab & PSB (& Wilson Lab on 14-Jul and 21-Jul)	Wilson Annex & Pine Tree Road	Notes
Network	Wired	Not available	Not available	Available	Cornell wiring in Annex and PTR
	Wifi (Cornell)	Not available	Available	Available	RedRover, eduroam, Cornell Visitor
	Wifi (CLASSE)	Not available	Not available	---	LNS Protected
Computers	Laptops	Not available	Available	Available	No new user logins
	Desktops	Not available	Not available	Available	No new user logins
Services	CLASSE	Not available	Not available	Not available	See list of CLASSE services below
	Cornell	Available (on phones w/ data plans)	Available	Available	See list of Cornell services below

Please see below for more details. If you have any questions or concerns, please submit a ServiceRequest.

Impact on Compute Farm

In preparation for the Wilson Lab power outages, most CLASSE Compute Farm batch queues will be disabled two days beforehand, starting Saturday, 12-Jul-2025 at 8:00 AM and will not be restored until Tuesday, 22-Jul-2025, approximately 8:00 AM.

Please note that interactive and CHESS queues are excluded from this two-day pre-outage pause; jobs running in these queues will instead be terminated on Monday, 14-Jul-2025 at 1:00 PM, when the Compute Farm is shut down. From Monday, 14-Jul-2025 at 5:00 PM to Friday, 18-Jul-2025 at 5:30 AM, interactive and CHESS queues will be running with reduced capacity.

Impact on General Computing

General CLASSE-IT services will be disrupted twice during this period: first on Monday, 14-Jul-2025 at 12:00 noon (for approximately 4 hours) and again on Friday, 18-Jul-2025 at 5:30 AM (for approximately 4 days). Please save your work to samba (central filesystems) and log out of your computer before this time. We recommend leaving end-user computers powered on, to avoid needing manual reboots when power is restored.

During these outages, the following CLASSE services will not be available from any location, onsite or offsite:

• Remote logins via ScreenConnect, NoMachine, etc.
• CLASSE VPN and other CLASSE networks
• Central filesystems, including Samba and Globus
• CLASSE web services: wiki, Indico, Timesheet, BeamPASS, GitLab, etc.
• AppsAnywhere
• Network license servers (Matlab, Autodesk Vault, Cadence, Mathematica, Ansys, etc.)
• Compute Farm
• Printing

However, central Cornell services will be available, e.g. Cornell email, Teams, Box, Workday, Zoom, etc. The CLASSE website, CHESS website, and CBB website will also be available.

After the Outages

Although we expect most central CLASSE-IT services to be restored by Tuesday, 22-Jul-2025 around 8:00 AM, individual end-user computers might need additional attention. If you have problems with your workstation or computing resources on Tuesday, please:

• First, try rebooting your computer, if possible.
• Then, submit a ServiceRequest if the problem remains.

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General network and server maintenance will occur every Tuesday from 12:00 noon to 2:00 PM. The CLASSE-IT group will always announce any expected disruptions in our NewsLetter and via CLASSE-IT-NEWS-L, but with the size and complexity of our network there is always the potential for something to go wrong. We will do our best to contain all network maintenance and planned outages to Tuesdays from 12:00 noon to 2:00 PM.

Unless other arrangements have been made, CLASSE-managed Windows systems may be updated and rebooted on Tuesday morning at 2:00 AM, so please avoid critical or lengthy operations at that time. For more details, please see SystemExpectations.

The BeamPASS application receives bug fixes and new features on Tuesdays. When these updates are made, users will be logged out but should be able to login again within a few minutes. If you find BeamPASS is unavailable for longer than that, please submit a ServiceRequest.

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Questions or problems? Submit a service request (or email service-classe@cornell.edu).

Other resources:

• CLASSE-IT Home Page
• Previous newsletters

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