This is the meta task for the September 2021 Datacenter switchover (codfw -> eqiad).
Services Monday, Sept 13th 14:00 UTC
Traffic Monday, Sept 13th 15:00 UTC
MediaWiki Tuesday, Sept 14th 14:00 UTC
This schedule should be considered confirmed if there are no reasonable objections to these dates by Aug 2 (a little less than a week from now). Schedule is confirmed now.
Previously: T281515: June 2021 Datacenter switchover
See also: https://wikitech.wikimedia.org/wiki/Switch_Datacenter