From: Kaushal Shriyan <kaushalshriyan at gmail.com> > Are there any utilities or tools to look at historical data of Memory, CPU > Utilization or IO activity on CentOS 6.4 or 5.9 Version? For example the > how much the memory was consumed for the period of last six months. The most lightweight, if you do not mind scripting a little bit, would be a "simple" cron script calling rrdtool. You can find many rrdtool examples online. JD