-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi, Later tonight we will upgrade the OS on hyacinth (s3/s4/s6 server). This will involve ~30 minutes downtime, but should have no impact on users. We will also upgrade the OS on willow at the same time, which should require <10 minutes downtime. If there are no problems with that upgrade, we will also upgrade the web servers (wolfsbane & ortelius); but the cluster software makes this upgrade more intricate, so it may not be completed tonight. That will have no impact on users, since web requests will be served by the other server while one is being upgraded. This maintenance will take place around 12AM UTC on Saturday (11th). - river.