Due to on-site maintenance (T226778) going on some of the racks that host our primary database servers, we need to switchover some of our current primary masters to other hosts, to ensure that there is not an unexpected downtime as result of this on-site maintenance.
For that, we would like to request the following read-only windows.
The impact is the same for all of them: **writes will be blocked, and reads will remain unaffected**
These are the windows, days, time and affected wikis:
s8: 10th Sept from 05:00-05:30 UTC. The affected wiki is: `wikidatawiki`
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
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
s4: 26th Sept from 05:00-05:30 UTC. The affected wiki is: `commonswiki`
If everything goes fine, we expect only to use a few minutes of each window and not the full 30 minutes.