Eariler I had no idea what exactly was going on but then later on after analysing everything I understood that my Kernel_task process wasnít behaving normally on my Macbook Air 2011. On Wednesday night I was trying to perform a timemachine backup and for that I connected my external hard drive into my Macbook machine. But during that time period I fond something weird, saw that the Kernel_task process was exceeding the normal level of CPU usage. Interstingly I encountered this issue only after I connect the external hard drive. The Kernel_task do not compromise below 100% usage. It is bound to either touch 100% or go beyond this level but never comes down until the external drive is disconnected. Actually most of the time even unplugging the external drive also doesnít makes any difference, in that case I am forced to hold down the power button which in turns reboot the machine. Just after the system is restarted the Kernel_task process comes down to the normal level.
This is not the first time I am trying to perform a timemachine backup, I have did this task multiple number of time during the initial time when the laptop was newly bought. But now donít know for what reason I am getting such high CPU usage by the kernel_task process. Thereís no doubt that it is the hard drive that starts the issue as the CPU usage rises only after I connect the external drive. However I suspect three things, firstly Lion, then the laptop and lastly the external drive. And as external hard drive play the major role I simply doubt it the most. Researched a lot about this issue on internet but didnít find any appropriate suggestion that would suite my machine or work for me. Therefore I decided to create a thread myself and look out for some useful and helpful information. So guys, please have a healthy discussion and help out from this issue.