Dgang

There is a tool that FermiLab use for cluster management. This may just be adding to a growing list of such tools and people may already know about it, but it caught my interest since a modified version exists that the FermiLab people use to manage their dCache systems. It basically allows you to execute the same command on a subset of the nodes in your cluster. This could prove useful for starting/stopping dCache services at sites that have a large number of nodes. This may be particularly relevant for sites running resilient dCache. Then again, such sites may already be using some other cluster management software like quattor. The benefit of the Fermilab one is that it appears to be pretty simple (written in python and uses ssh to comminicate with the nodes). You can find out more about the tool (rgang) here. The dCache version is called dgang.