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02-23-2013, 02:39 AM
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#1
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Member
Registered: Feb 2004
Location: BARODA, GUJARAT
Posts: 259
Rep: 
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Difference between CPU Usage from Vcentre end and OS end - RHEL5
Hi,
One of the VM went unresposnive of RHEL5, while checking we found that CPU utilization from Vcentre was 100%. In the same ref. we have rebooted it, while later on checking sar -A we found that it shows 90 % CPU idle during the same interval.
I would like to understand why there is discrepancy of both the details.
Thanks
Rajan
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02-23-2013, 08:55 PM
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#2
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Member
Registered: Dec 2012
Location: inside the matrix
Distribution: Debian, Xubuntu, Gentoo, Antergos
Posts: 90
Rep:
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Did you bother to look at the disk/network I/O of the VM from vCenter?
If the VM is I/O bound, you're not going to see that in the CPU utilization of the guest OS because of the abstraction in the hypervisor.
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