AlmaLinux 9 Upgrade Plan

This is WilliamSeligman's proposal for the AlmaLinux 9 upgrade. Please contact him if you have any questions or suggestions.

The upgrades are scheduled on days that are Columbia University holidays, to hopefully minimize the impact on anyone's work.

Mon Dec 25, starting roughly at 10AM

shang (DOE server and old home directories)
milne (transient student home directories)
kolya (ATLAS home directories)
katya01 (ATLAS GPU server)

Wed Dec 27, starting roughly at 10AM, the Neutrino systems

houston (home directories)
hopper (GPU server)
riverside (file server)
westside (file server)

This was delayed from Tue Dec 26. The remaining Neutrino systems cannot be upgraded to AlmaLinux 9. Those systems will be retired gradually as they're replaced or they fail.

Wed Dec 27, starting roughly at 10PM

Mail server transition to postfix

Suggestion: Quit the mail reader (Thunderbird, Outlook, Apple Mail) on all your devices (laptop, phone, tablet) before 10PM. Start it again the following morning. If you don't do this, you'll get lots of "cannot connect to server" messages; you'll probably have to restart your mail reader after the transition anyway.

If you have problems sending mails afterwards, you can reach me at william.seligman of gmail.com.

Fri Dec 29, starting roughly at 10AM, the VERITAS/CTA systems

serret (file server)
ged (file server)

tehanu (home directories) and vetch (file server) will be upgraded later, as part of a transition to a new server to replace tehanu.

Mon Jan 1, starting at roughly 10AM, the base ATLAS Tier3 cluster systems

xenia
xenia2
xenia3

The remaining xeniaNN nodes will be upgraded at a later date.

-- William Seligman - 2023-12-14