刚才去登陆自己的WPMU站，进入后台管理突然发现
WordPress MU 2.7.1 is available! Please update

点击了update，自动更新

Downloading update from http://mu.wordpress.org/wordpress-mu-2.7.1.zip

Unpacking the core update

Verifying the unpacked files

Installing the latest version

Upgrading database

WordPress upgraded successfully

暂时一切顺利，先试试看怎么样