The San Francisco colocation facility being used by Linden Lab for housing much of the Second Life grid is undergoing electrical maintenance on Saturday 15 September (tomorrow). Previously, this was announced for Friday, one of the quietest nights of the Second Life week, however it has now been rescheduled to Saturday night, one of the busiest.
The work will go from approximately 9pm SLT (US Pacific) and continue as late as 3am SLT the following morning. The Aditi grid, currently being used as the beta/preview/test grid will be down completely, along with 320 or so regions from the main (Agni) grid.
