This task is for discussing the pooling schedule for eqiad during the March 2023 Datacenter Switchover.

Tentative schedule according to https://wikitech.wikimedia.org/wiki/Switch_Datacenter#Overall_switchover_flow is that we'll leave eqiad completely depooled at the traffic level for 1 week, followed by 7 weeks of multi-DC with eqiad as the RO datacenter.

February 28th: Depool eqiad at traffic layer
March 8th: Repool eqiad at traffic layer
March 14th: Repool A/A services and mediawiki RO in eqiad
March 28th: Depool A/A and mediawiki RO in eqiad for T330165: eqiad row B switches upgrade

Discussion started in T290989: switchdc cache warmup should include URLs that warmup relevant Wikidata caches

In T290989#8588822, @Marostegui wrote:

If we are going to leave eqiad fully depooled for a week...can we do the switches operation during that time or leave eqiad depooled for longer and fit them there? @ayounsi thoughts?

In T290989#8588837, @ayounsi wrote:

It's technically possible but a more aggressive schedule would require the buy-in from everybody (including services that only live in eqiad like analytics).
We can see it as "ripping the band-aid" vs. going carefully.