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Which VMware metrics to keep low CPU ready or CPU wait ?

Posted on 2014-08-19
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Last Modified: 2014-10-13
Hi All,

My newly build vanilla Windows Server 2012 R2 with just one vCPU and 8 GB vRAM is running slowly with nothing installed in it, the server manager opens slowly with more than 3 minutes waiting to open the window.

Based on the observation on the CPU metric below, I’m not sure what is the best threshold to keep it under certain level?

Here’s from the VM itself:

VM CPU statistics
Here’s from the ESXi server where the VM above is currently running:

ESXi server vCPU statistics
I’ve keep the total vCPU usage number of VM under 32, as can be seen below the total vCPU usage is 14: (the highlighted is the performance constrained VM that I have just deployed):

VM vCPu usage total
While the below screenshot is the ESXi specs which shows that maximum 32 available vCPU that can be assigned:

hardware CPU information
Can anyone please shed some light in what do I need to do here to make sure that the VM is not constrained by the CPU ?
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Comment
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20 Comments
 
LVL 124
ID: 40271867
Add another vCPU. (socket) does it get better...

VM is not running on a snapshot, or the VM is not doing a Windows Update ?
0
 
LVL 8

Author Comment

by:Senior IT System Engineer
ID: 40271872
No, it is plain vanilla OS, nothing is added into it.

I have not put any software in it yet. Why is that VM is having some problem with the VM CPU wait and latency that is way so high ?
0
 
LVL 124
ID: 40271884
It's not doing a Windows Update ?
0
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LVL 8

Author Comment

by:Senior IT System Engineer
ID: 40271940
no it is not, I've just logged in through RDP and it is very slow.
0
 
LVL 124
ID: 40272009
Anything going in in Task Manager ?
0
 
LVL 8

Author Comment

by:Senior IT System Engineer
ID: 40272019
Nothing that I can see, it running idle.
0
 
LVL 124
ID: 40272034
No reservation applied to the VM,  CPU or Memory ?
0
 
LVL 8

Author Comment

by:Senior IT System Engineer
ID: 40272146
no there is no Resource Pool and Reservation in the Data Center configured.
0
 
LVL 124
ID: 40272166
and, nothing set on the individual VM ?
0
 
LVL 124
ID: 40272169
does this VM always have this issue, any other VMs with other issues?

have you patched it?
0
 
LVL 8

Author Comment

by:Senior IT System Engineer
ID: 40272200
only this one, the other does not have any issue.
0
 
LVL 124
ID: 40272205
I think I would be tempted to quickly install Windows 2012 R2 again, as another VM as a test.
0
 
LVL 8

Author Comment

by:Senior IT System Engineer
ID: 40302660
So what could be the possible issue that slows down this VM when nothing is running within the VM itself ?
0
 
LVL 124
ID: 40302835
Bad Installation, Malware, Virus....

DId you try a re-install ?
0
 
LVL 8

Author Comment

by:Senior IT System Engineer
ID: 40302861
No, there is no way virus or malware attacking, this server is installed with Symantec Endpoint Protection 12.1.4 with regular updates.
0
 
LVL 8

Author Comment

by:Senior IT System Engineer
ID: 40378789
ok, so in this case which metrics (CPU ready or CPU wait) that I need to look for to determine if the ESXi host is "too busy" or over capacity ?
0
 
LVL 124

Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 40378828
CPU Ready (it's a bad name and description really!).

see here also

http://www.yellow-bricks.com/esxtop/
0
 
LVL 8

Author Closing Comment

by:Senior IT System Engineer
ID: 40378844
Thanks!
0
 
LVL 124
ID: 40378859
What datastore are to you using?

e.g. RAID type, Disk type SATA or SAS ?
0
 
LVL 8

Author Comment

by:Senior IT System Engineer
ID: 40378865
I'm using VMFS 5 data store that is presented to the ESXi cluster using EMC VNX Storage pool RAID-5
the disk is just FC SAN disk 10k RPM
0

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