Dear all,
*"There is nothing permanent except change - Heraclitus"*
On *Wednesday March 20th 2024,* the SRE team will run a planned datacentre
switchover, moving all wikis from *codfw* to *eqiad*. This is an important
periodic test of our tools and procedures, to ensure the wikis will
continue to be available even in the event of major technical issues in our
primary home. It also gives all our SRE and ops teams a chance to do
maintenance and upgrades on systems in codfw that normally run 24 hours a
day.
The switchover process requires a brief read-only period for all
Foundation-hosted wikis, which will start on *Wednesday March 20th 2024 @
14:00 UTC*, and will last for just a few minutes while we execute the
migration as efficiently as possible. All our public and private wikis will
be continuously available for reading, as usual, but editing will be
unavailable during the process. Users will see a notification of the
upcoming maintenance, and anyone still editing will be asked to try again
in a few minutes.
CommRel will soon begin notifying communities of the read-only window.
If you like, you can follow along on the day in the public
*#wikimedia-operations* channel on IRC. To report any issues, you can reach
us in *#wikimedia-sre* on IRC, or file a Phabricator ticket
<https://phabricator.wikimedia.org/maniphest/task/edit/form/1/?projects=Datacenter-Switchover>with
the #datacenter-switchover tag; we'll be monitoring closely for reports of
trouble during and after the switchover. The switchover and its preparation
will be tracked under
https://phabricator.wikimedia.org/T357547.
On behalf of the SRE team, please excuse the disruption, and we would like
to thank everyone in various departments who are involved in planning this
work. If you have any questions, please reply directly to this email.
Kind Regards,
-effie