Expand your knowledge of hardware, software and supercomputing

Finding the serial number of your ACT system

When contacting support, it’s best to find the serial number of your ACT system and have it handy when you open a ticket via the website, via email, or when calling in.  Providing the serial number allows us to quickly look up your system, and see the configuration of your system which is often relevant […]

Check the status of an LSI raid card battery backup unit

Checking on the status of your raid cards battery backup unit (BBU) is a simple process by using the following MegaCli command: $ MegaCli64 -AdpBbuCmd -a<adapter#/ALL> In the following example we have a single controller present and will pass the -a0 argument to select the controller. [root@localhost ~]# MegaCli64 -AdpBbuCmd -a0 BBU status for Adapter: […]

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 […]

What do I need to do when replacing a motherboard?

After replacing a failed motherboard, steps need to be taken to allow the network configuration in Linux work without disruption.  Here, we outline the steps to take on an Enterprise Linux system.  Console access is required for the node getting the replacement; the local steps can be taken as soon as the motherboard is replaced […]

Sync users across nodes

Any time you add a new user on your cluster’s head node or make changes to an existing user, you will need to synchronize those changes across the entire cluster. Advanced Clustering makes this a simple task by using our act_authsync utility. This utility takes all system user configuration files and pushes them out to […]

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] […]

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