[downtime] CS System Downtime, Tuesday, September 3, 2019,

Date: Tuesday, September 3, 2019 (06:00-10:00)

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

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

What is happening:
During this window, the cycles systems will be replaced with newer
hardware, and the courselab systems will be reinstalled and updated with
the latest distribution version of Springdale Linux 7.6. Armlab systems
will be rebooted.

SPECIAL NOTE: As we are reloading the Linux servers, all crontabs will be
deleted. If you have crontabs that you wish to persist, you will need to
back up your crontabs before the downtime, and restore them after.

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

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.

CS Staff
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