Sun's Linux killer shows promise | The Register: "Solaris containers (aka 'zones') are also noteworthy. They're virtual environments a bit like BSD jails, only slicker. Each container looks and feels like an isolated, virtual instance of the kernel, yet when idle, one container will use about 0.5 per cent of system resources, and fifty idle containers use about five per cent. One can choose maximum amounts of processing power to assign to each one, and the system will automatically distribute unused resources up to that limit among containers assigned less, and return it according to demand. One logs in to a container just as one would log in to a regular system, and all processes are effectively isolated. A container brought down by a hostile application can be restarted in a few seconds, without any wider impact."
It's time to short RedHat. Well may be not quite yet but its worth watching.
Solaris is a far more accomplished OS than any flavour of Linux especially with the new features in Solaris like containers, Live Upgrade, DTrace and others.
According to the article above Solaris is not quite ready for the x86 world because of lack of drivers for many popular devices found in common x86 boxes.
So if Sun does address this, you should see RedHat and other vendors starting to suffer especially with all the other software you can obtain from Sun which is often bundled in with Sun boxes.
Another space to watch