Expand your knowledge of hardware, software and supercomputing

Setup ACT Breakin hardware diagnostics tool as a grub boot option

Breakin is Advanced Clustering Technologies stress-test and hardware diagnostics tool. It is extremely useful for detecting errors on your system while stress testing the hardware at the same time in order to create a more realistic test environment. This guide is best used for head nodes and workstations that do not have a built in […]

Server doesn’t POST – Determining if an DIMM, CPU, or MotherBoard is faulty

In this example we will troubleshoot when a server fully powers on but does not post. The three most common reasons why a server will not post is either a bad DIMM, bad CPU, or bad motherboard. The main objective of all this is to start with a minimum amount of components in the server, […]

What is a kernel panic?

A message displayed by the Linux kernel upon detecting an internal system error from which it cannot recover. Kernel panics are often software errors, but many times can an indicator of hardware issues. Common types of kernel panics The two most common types of kernel panics are: Kernel panic: VFS: Unable to mount root fs […]

Replacing an LSI raid disk with MegaCli

If you have identified a failed, or failing disk, it is possible to replace it using the MegaCli utility. In the example below we will cover replacing a failed disk from a raid 5 that has three disks total. The first thing we want to check is the status of our raid 5. [root@raid log]# MegaCli64 […]

Test a compute node’s hardware with Breakin

Clusters built by Advanced Clustering Technologies come with the ability to easily set compute nodes to be able to boot to our Breakin utility to stress test the machine. This is an easy way to test the node for hardware errors. To set a compute node to boot to Breakin from the head node: $ […]

How to locate a physical disk in an LSI raid array

The MegaCli command line utility can be used to locate a physical disk in an LSI raid array by blinking the disks activity LED. The blinking will continue until directed to stop. Syntax: MegaCli64 -PdLocate <-start|-stop> -physdrv[<enclosure#>:<disk#>] -a<adapter#> In this example we will locate disk 0 on adapter 0: [root@localhost MegaCli]# ./MegaCli64 -PdLocate -start -physdrv[252:0] […]

RAM – Checking for errors

Run BreakIn It can be difficult to tell if a memory error is related to hardware or software. To help determine this we suggest running the ACT breakin utility to remove any possibility of software related errors. Breakin for compute nodes Breakin for head nodes and CentOS work stations Run memtest86+ memtest86+ is a free utility […]

What type of power receptacles do I have?

NEMA Receptacle Types There are many different types of NEMA power receptacles and plugs. If you already have power receptacles installed at your site and you are wanting to determine what type of NEMA plug you have, included below you will find the most common types of NEMA receptacles for the PDUs we sell at […]

How to identify and prevent overheating

How to identify and prevent overheating Symptoms of Overheating Turning off on its own Freezing Frequent memory errors Most commonly a computer that is overheating will turn off unexpectedly, and repeat the behavior shortly after being turned back on. What causes this behavior is that the CPU temperatures are always monitored and the system will […]

Identifying Issues with Network Connectivity

Network connectivity can cover many different areas, and diagnosing which area your problem lays in is the first step to fixing the problem. Below we will cover multiple steps for identifying a problem. Verify connections and LEDs Verify that the network cable is properly connected to the back of the computer and at the switch. […]

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