Hardware diagnostics

Find out how to use diagnostic tools to identify hardware failures on your server

Last updated 15th December 2022


At some point during the life of your server, you may encounter a fault due to a hardware issue. For these issues, your server is equipped with some diagnostic tools to help identify faulty hardware components.

This guide will show you how to diagnose hardware issues on your server.



This guide details the tests you need to carry out to diagnose:

  • Processors
  • Network connection
  • Memory
  • Disk partitions


The processor test checks the working order of your server's processor, and needs about 30 minutes to run successfully. If the server crashes during this test, then it means that the processor is faulty.

WRKR=$(grep -c "^processor" /proc/cpuinfo)
stress-ng --metrics-brief --timeout 60s --cpu $WRKR --io $WRKR --aggressive --ignite-cpu --maximize --pathological
stress-ng --metrics-brief --timeout 60s --brk 0 --stack 0 --bigheap 0 

Network Connection

The network connection test checks your internal and external bandwidth. This data is provided for information purposes only and is not a performance test.

ping -c 10 proof.ovh.net
for file in 1Mb 10Mb 100Mb 1Gb ; do time curl -4f https://proof.ovh.net/files/${file}.dat -o /dev/null; done


The memory test checks the integrity of your server's RAM modules. If the server crashes during this test, then it means that the one or more of your RAM modules is faulty.

Warning, this test can be very long.

RAM="$(awk -vOFMT=%.0f '$1 == "MemAvailable:" {print $2/1024 - 1024}' /proc/meminfo)"
memtester ${RAM}M 1

Disk Partitions

The partitions test is comprised of a disk access test and a file system check. The disk access test checks if the system can communicate with your server's hard drives. The file system check uses the fsck -fy command to check the entire file system.

stress-ng --metrics-brief --timeout 60s --hdd 0 --aggressive

Go further

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