This is actually fine for a closed environment like an SP, but for something to be run on just a stack of otherwise useful boxes, you need more freedom. Whatever suits your security needs best. The idea here is that these dsh-like programs allow you to do something akin to load balanced scripting. Generally speaking, the run command will achieve better results as the size of the cluster increases. If you have only three nodes, the odds of getting the same node over and over are fairly good.
Barrier sync for shell scripting.
This is a new idea. The barrier mechanism consists of a daemon run on a host, and a client which can be used to barrier sync with. Source ClusterIt 1.3 Source Latest ClusterIt package for NetBSD ClusterIt is known to work on all arches of NetBSD 1.3 and later, Solaris 2.51 and 2.6, AIX 4.3 and 4.2.1. ClusterIt is Free software, with a standard BSD-style License. You are encouraged to download this, work with it, enhance it, or whatever suits your needs.