We will be upgrading the kernels on all RedHat Enterprise Linux 4 servers tomorrow between 3pm GMT and 7pm GMT.
The downtime on each server should only be a few minutes.
The servers are mamba, krait, web1 to web20, dweb3 to dweb14 and mail1 to mail4.
We’ll update this post once the work is done.
Update [12:58 PM CST]: Done