Solaris Zones Survived A Year

One of my servers has survived a year without shutdown/reboot. The server is running a virtualised grid environment on Solaris 10 container. As you can see in the screen dump, it has 3 SGE (Sun Grid Engine) execution hosts (virtual) with 4 slots for each host. All users (54 of them) are given a Solaris zone as their development environment for grid computing and they are able to submit jobs (including MPI) to the virtualised grid.

The whole setup runs on Sun Fire X4600