Hi,

We have a strange thing, which not clear to us.
When provisioning a new VM via REST API, if the number of vCPU for that VM is more than 16, I'm getting this error:

Fault reason is "Operation Failed". Fault detail is "[Cannot add VM. Maximum number of threads per cpu exceeded]". HTTP response code is 409.

Our version is: Version 4.3.6.6-1.0.9.el7

Note that manual provisioning from the UI do not produce any error when using vCPU > 16.
It seems like the issue is related to this setting (from the engine):

[root@olvmengine01 ~]# engine-config -g MaxNumOfThreadsPerCpu   
MaxNumOfThreadsPerCpu: 8 version: 4.1
MaxNumOfThreadsPerCpu: 8 version: 4.2
MaxNumOfThreadsPerCpu: 8 version: 4.3
[root@olvmengine01 ~]#

But when trying to set it to another number, I'm always get this error, for example:

[root@olvmengine01 ~]# engine-config -s MaxNumOfThreadsPerCpu=10
Please select a version:
1. 4.1
2. 4.2
3. 4.3
3
Cannot set value 10 to key MaxNumOfThreadsPerCpu.

Questions:
1. Can you please explain why we getting this error: "Cannot add VM. Maximum number of threads per cpu exceeded"?

2. Is it related to engine-config -g MaxNumOfThreadsPerCpu?

3. Why it is working manually via the UI?

4. if its related to engine-config, why we can't set it to another number?

Thanks in advance,
Lavi
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