Linux I am aware of

Understanding the Cloud Computing Stack: SaaS, PaaS, IaaS Executive Summary   Cloud Computing  is a broad term that describes a broad range of services. As with other significant developments in technology, many vendors have seized the term “Cloud” and are using it for products that sit outside of the common definition. In order to truly understand how the Cloud can be of value to an organization, it is first important to understand what the Cloud really is and its different components. Since the Cloud is a broad collection of services, organizations can choose where, when, and how they use Cloud Computing. In this report we will explain the different types of Cloud Computing services commonly referred to as Software as a Service (SaaS), Platform as a Service (PaaS) and Infrastructure as a Service (IaaS) and give some examples and case studies to illustrate how they all work. We will also provide some guidance on situations where particular flavors of Cloud Computing are not the b

This article describes how to install and use sar (sysstat) a system performance tools for Linux. It comes with plenty of sar examples and usage. Sar is part of the sysstat package. According to the package description it includes the following system performance tools: sar: collects and reports system activity information; iostat: reports CPU utilization and disk I/O statistics; mpstat: reports global and per-processor statistics; pidstat: reports statistics for Linux tasks (processes); sadf: displays data collected by sar in various formats. Using sar you can monitor performance of various Linux subsystems (CPU, Memory, I/O..) in real time. You can also collect all performance data on an on-going basis, store them, and do historical analysis to identify bottlenecks. I do not take credits for this post, I have just collected pieces of info from different websites that I found useful and put them together. I thank Ramesh Natarajan from TheGeekStuff.com  for publishing his ori