Due to malfunctioning hardware on the s2 database primary master (T194867) we need to do a failover (T194870) to another database host.
In order to be able to do so, we'd need have a 30 minutes read-only window for those wikis.
The affected wikis are:
bgwiki bgwiktionary cswiki enwikiquote enwiktionary eowiki fiwiki idwiki itwiki nlwiki nowiki plwiki ptwiki svwiki thwiki trwiki zhwiki
Date: 13th June 2018
Time: 06:00AM UTC until 06:30AM UTC
Impact: The above wikis will be on read only, so no new edits will be able to happen. Reads will remain unaffected.
We are requesting 30 minutes, but we hope to have it done in around 5 minutes, if everything goes as planned, however, we'd like to get some more room in case something unexpected happens.