The Operations Working Group are in the process of planning some hardware moves as a result of maintenance at our primary datacentre. The plans are subject to change, but these moves are expected to take place on Monday 9th May (a week from today), and this will mean a period of read only operation lasting for up to 24 hours (into Tuesday).
The read-only period will mean the OpenStreetMap website and map is still available, but no map editing will be possible during this time.
The ‘2016 May server maintenance’ wiki page has some more technical details, and will be updated with more precise timing information as the plans are finialised in the coming days.
We’re putting out this announcement to give some advanced notice, but we appreciate some people will be wanting to know more about the exact timings of the read-only period. Please have patience. The Operations Working Group are busy making plans, and will aim to firm things up in the coming days.