memtest86 Command: Tutorial & Examples
Checkin RAM for errors
memtest86 command is a robust utility in Linux that checks your system's RAM for errors. This command is extremely
vital as it helps in troubleshooting hardware problems that could be causing system instability, crashes, and data
As a Linux server administrator, understanding how to use the
memtest86 command is crucial for
maintaining system stability and performance. This command can diagnose potential memory issues that can lead
to high load, system crashes, or
even data corruption.
How memtest86 Works
memtest86 software works by writing test patterns to every memory address, then reading back these patterns to
verify the integrity of your RAM. It pushes your memory to its limit, carefully checking for errors. It's a standalone
program that boots from a USB or CD and tests the RAM in your machine for faults using a series of comprehensive
algorithms and test patterns.
Why memtest86 Is Important
Memory errors can cause serious system problems such
as random reboots, system hangs,
or even data corruption. It's often hard to diagnose these issues, as they can appear
sporadically and may be mistaken for software bugs. By using
memtest86, you can isolate these problems and potentially
save hours of troubleshooting.
Typical Problems Solved by memtest86
memtest86 can help in diagnosing memory-related issues such as:
- Random system crashes or reboots
- Unexplained system slowness
- Programs crashing unexpectedly
- Operating system not booting
Using the memtest86 Command
When your system reboots, select
memtest86 from the GRUB menu. The test will start automatically.
Please note, memtest86 can take a long time to complete, especially with larger amounts of RAM. It's recommended to run this test when you don't need to use the computer, such as overnight.
Understanding memtest86 Output
memtest86, you'll see a series of tests being performed on your screen. If the test finds an error, it
will be displayed like this:
Tst Pass Failing Address Good Bad Err-Bits Count Chan
--- ---- ----------------------- -------- -------- -------- ----- ----
8 0 0000893f7d0 - 137.0MB ffffffff fffffeff 00000100 1
This output indicates that an error was found in the memory address
0000893f7d0. The "Good" column shows the expected
result, the "Bad" column shows the value that was actually read, and "Err-Bits" shows the difference.
memtest86 is an invaluable tool when it comes to diagnosing and troubleshooting memory-related issues
in your Linux server. It's a robust tool that can save a lot of time and prevent potential data loss caused by