RAM failure

To check for RAM failures on running system:

Install memtester tool:

yum install memtester

If yum does not work (because of possible RAM failure), download memtester RPM and its dependencies and install those:

rpm -Uvh file.rpm

Run test:

memtester 5 1

"5" is amount of memory to be be tested in megabytes. Basically value can be replaced with amount of free space on RAM.

If output shows lines which starts with "FAILURE", RAM module is faulty. It has to be replaced.