Hello, 

The following primary database masters will be switched over during the next few weeks (more details at https://phabricator.wikimedia.org/T230788):

Impact:

Writes will be blocked

Reads will remain unaffected

These are the concrete days, hours and affected wikis:

* s8: 10th Sept from 05:00-05:30 UTC. The affected wiki is: wikidatawiki - tracking task: T230762

* s2: 17th Sept from 05:00-05:30 UTC. The list of affected wikis is at: https://raw.githubusercontent.com/wikimedia/operations-mediawiki-config/master/dblists/s2.dblist  - tracking task: T230785

* s3: 24th Sept from 05:00-05:30 UTC. The list of affected wikis is at: https://raw.githubusercontent.com/wikimedia/operations-mediawiki-config/master/dblists/s3.dblist - tracking task: T230783

* s4: 26th Sept from 05:00-05:30 UTC. The affected wiki is: commonswiki - tracking task: T230784

If everything goes well, we do not expect to use those 30 minutes of read-only and rather just a few minutes.

We will email send an email the day of each failover before and after it is done.

Sorry for any inconvenience this might cause.