[downtime] CS System Downtime, Tuesday, January 30, 2018, 06:00-09:00

Date: Tuesday, January 30, 2018 (06:00-09:00)

Who is affected:
All users of the CS Staff-managed public login systems, including the
cycles and courselab systems.

All users of the CS Department Beowulf high performance computing cluster,
known as ionic.

All users of departmental webservers, including user webspace
(www.cs.princeton.edu/~${user}), project webspace
(${projectname}.cs.princeton.edu), departmental web services
(www.cs.princeton.edu/courses/), and other internal applications
(iw.cs.princeton.edu et al).

What is happening:
During this window, these systems will have their OSes reinstalled and
upgraded to the latest distribution version.

Why is it happening:
This is part of regular maintenance to keep systems up-to-date.

In addition, we will be patching against Spectre security bug. More
information available here:

https://access.redhat.com/security/vulnerabilities/speculativeexecution

We will post updates to the status page: http://www.csstaff.org
as necessary.

If this downtime will cause you undue hardship, please contact
csstaff@cs.princeton.edu immediately, so we can discuss options to reduce
any negative impact. Your patience is appreciated.

Sincerely,
CS Staff
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