24-Jul-2023

NoMachine Update: Tuesday, 25-Jul-2023

If you are a NoMachine user, at the end of TODAY, Monday, 24-Jul-2023, please save your work and log out of any NoMachine Virtual Desktops. On Tuesday, 25-Jul-2023, starting at 4:00 AM, all NoMachine servers will be updated to the latest release. When this update occurs, remote connections will be interrupted and all NoMachine Virtual Desktops will be deleted. This release includes one bug fix submitted by CLASSE, but otherwise should be transparent. Please submit a ServiceRequest with any questions or concerns.

CLASSE Computing Outages: 26-Jul-2023 to 31-Jul-2023

From Wednesday, 26-Jul-2023, through Monday, 31-Jul-2023, CLASSE computing services both onsite and offsite will be disrupted by a scheduled power outage at Wilson Lab. Please note that, although Wilson Lab will regain power on Sunday, 30-Jul-2023, we do not expect to have most CLASSE-IT services restored until end-of-business on Monday, 31-Jul-2023. Additional recovery efforts might extend farther into the week. Here is a summary timeline, along with recommended actions for users:

Day	Time	Action
Wed 26-Jul	8:00 AM	Compute Farm capacity reduced, batch queues disabled
Fri 28-Jul	Before 6:00 AM	Please save your work and log out
Fri 28-Jul	6:00 AM	Most CLASSE-IT services shut down, including Compute Farm and CESR/CHESS control systems
Fri 28-Jul	7:00 AM	Wilson Lab power cut
Sun 30-Jul	Afternoon	Wilson Lab power restored
Sun 30-Jul	Late night	CESR/CHESS control systems restored
Mon 31-Jul	5:00 PM	Most CLASSE services restored; reboot your computer if necessary

Service availability during the power outage

Between Friday, 28-Jul-2023, 6:00 AM and Monday, 31-Jul-2023, 5:00 PM, computing services in each building will be affected as follows:

		Wilson Lab (incl. modules)	Newman Lab & PSB	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. Also, you may subscribe to CLASSE-IT-NEWS-L to receive email announcements during these outages. If you have any questions or concerns, please submit a ServiceRequest.

Impact on Compute Farm

In preparation for the Wilson Lab power outage, most CLASSE Compute Farm batch queues will be disabled two days beforehand, starting Wednesday, 26-Jul-2023 at 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 Friday, 28-Jul-2023 at 6:00 AM, when the Compute Farm is shut down.

Impact on General Computing

Most CLASSE-IT infrastructure will be shut down before the power outage, on Friday, 28-Jul-2023 at 6:00 AM. 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 the CLASSE computing outage, 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, CLASSE website, CHESS UserDB, Gitlab, etc.
• AppsAnywhere
• Network license servers (Matlab, Autodesk Vault, Cadence, Mathematica, etc.)
• Compute Farm
• Printing

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

After the Outage

Although we expect most central CLASSE-IT services to be restored by Monday, 31-Jul-2023, 5:00 PM, 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.

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Questions or problems? Submit a service request.

Other resources:

• CLASSE-IT Home Page
• Previous newsletters

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