Expand your knowledge of hardware, software and supercomputing

Use act_locate to identify a node

Most Advanced Clustering chassis are equipped with a large locater LED on the front that can be used to easily identify a node when it’s turned on. If you’re remotely attempting to notify a technician as to which compute node needs work, you can simply run the following command from your head node: $ act_locate […]

Checking InfiniBand

If one of your machines has an InfiniBand device installed and you want to know what state the device is in, you can use the “ibstat” command. The output of “ibstat” shows a lot of information, but the two main lines you should look at are: State: Active Physical state: LinkUp The “State” line can […]

Using grep to filter results

The command line utility “grep” is one of the most powerful and useful tools in Linux. Its most common use is to filter results from everyday commands. For instance, if you want to see all the hostnames your system has mapped out in /etc/hosts you can simply run: $ cat /etc/hosts But if you know […]

Use the command line to easily find hard drive manufacturer information

If you ever need to get your hard drive’s model and serial number without physically looking at it, you can do so with the hdparm command line utility. This is especially useful if a manufacturer requires the serial number for an RMA or any other servicing needs. In this example, we are retrieving the model […]

Changing Contents in a File in Every Node

Occasionally you may want to change a a single string inside of a file that is on every compute node. If the file was the same on every node you could change it in one place and then copy it out like so: $ act_cp -g nodes /path/to/file Some config files are unique to each […]

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