On Tue, Feb 23, 2021 at 4:10 PM Lavi.Buchnik--- via Users <[email protected]> wrote:
> 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"? > You've specified a value for threads-per-core that exceeds the MaxNumOfThreadsPerCpu limit. 2. Is it related to engine-config -g MaxNumOfThreadsPerCpu? > Yes > 3. Why it is working manually via the UI? > The UI sets the CPU topology for you when you specify the number of vCPUs (for 16, it produces #sockets = 16, #cores=1, #threads=1). > 4. if its related to engine-config, why we can't set it to another number? > You can change the values that engine-config accepts for MaxNumOfThreadsPerCpu by changing MaxNumOfThreadsPerCpu.validValues in /etc/ovirt-engine/engine-config/engine-config.properties but I think it would be better to specify a better CPU topology in the request.. > > Thanks in advance, > Lavi > _______________________________________________ > Users mailing list -- [email protected] > To unsubscribe send an email to [email protected] > Privacy Statement: https://www.ovirt.org/privacy-policy.html > oVirt Code of Conduct: > https://www.ovirt.org/community/about/community-guidelines/ > List Archives: > https://lists.ovirt.org/archives/list/[email protected]/message/CRKRVCWPUIN6HGU4OBTAC7Z4TNUACP6U/ >
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