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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.


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?


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 ...


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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