Month: November 2022 - the blog of Quantum Hosting®

The danger of a custom 404-page

One customer running a single WordPress was using a 4x vCPUs instance on Amazon AWS®. But the CPU and load usage were so high, with no apparent reasons (the number of visitors was reasonable). However: each 404 triggered a huge CPU and bandwidth consumption! A test was conducted and the 404 was replaced by a… read more »

Amazon AWS® bad discovery: overselling

This is the CPU monitoring usage on an EC2 instance in Ireland (t3a.xlarge). Two things to notice:-the left graph has an average of 40% of white background (it does not reach the full 400% CPU height)-the left graph has a maximum of 46% CPU steal (which is the red part, and it should not be… read more »

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