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The problem existed with kernel 2.6.32-431.el6 from CentOS 6.5. At the time the question was posed, this was a fairly old kernel. We looked at the changelog for RHEL/CentOS kernels, and saw lots of NFS-related activity. So we upgraded to (what was) the newest CentOS 6.6 kernel, 2.6.32-504.12.2.el6, and haven't experienced the problem since.


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Askubuntu has questions (and answers) for that Why aren't old linux-images removed when installing new kernel updates? How do I remove or hide old kernel versions to clean up the boot menu?


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That seems normal to me. For each kernel package, most of the kernel code (modules such as drivers) is stored in /lib/modules/ (with some in /lib/firmware/). On the other hand, the images in /boot require less than 10MB of disk space between them. The following lists the kernel image files for version 3.2.0-87 with sizes in kB. 4892 ...


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Virtualization is very prone to clock drift. A cpu can only do one thing at a time so keeping track of the time for many machines is quite tricky. Here are the best practices for time keeping in VMWare: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1006427



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