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On Fri, 23 Feb 2024 at 12:50, effie mouzeli <> wrote:

> 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
> <>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
> 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
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