Hi,
We need around 20 minutes of downtime to all services that write to db9 for replication maintenance. Outside of services that support the ops team, this primarily means bugzilla, etherpad, and civicrm. It will remain available for read queries, however, so read usage of services such as the tech blog should continue along fine. I'm planning to start this on Weds at 18:00 PST and will send follow-up mail at the start and completion of maintenance.
-Asher