I recently switched over my WPMU sites from a hosted web environment to a Linode VPS. The VPS is running Ubuntu Server 8.04 LTS with the default Apache2, MySQL and PHP installations. Since switching over to the new VPS, I've noticed that my sites will occasionally become unresponsive, requiring a reboot.
I'm sure this is related to the VPS, since everything worked fine on my hosts. But I'm wondering if anyone here ran into a similar problem for which a tweak to WPMU might be the solution? The funny thing is: when the unresponsiveness happens, there's no corresponding spike in CPU usage, network traffic or disk I/O.
Thanks for any help you can give me