Between 23:00 and 23:59 UTC, February 9th 2016 there is a scheduled maintenance window that will affect some of the wikis hosted by the Wikimedia Foundation. The maintenance is needed in order to perform necessary hardware, operating system and database upgrades. During the upgrade, content on affected wikis will be available at all times, but edits may fail during approximately 5 minutes within that schedule (these wikis will be in "read only mode"). The following wikis will be affected:
bg.wikipedia.org bg.wiktionary.org cs.wikipedia.org en.wikiquote.org en.wiktionary.org eo.wikipedia.org fi.wikipedia.org id.wikipedia.org it.wikipedia.org nl.wikipedia.org no.wikipedia.org pl.wikipedia.org pt.wikipedia.org sv.wikipedia.org th.wikipedia.org tr.wikipedia.org zh.wikipedia.org
All other wikis will *not* be affected by this maintenance.
I apologize in advance for this disruption and will try to minimize the duration of the maintenance work.
I will update https://wikitech.wikimedia.org/wiki/Planned_Maintenance-February_9_2016 after the maintenance has finished.