topic Re: Ontap Sim 9.9 High CPU Usage in Simulator Discussions

Ontap Sim 9.9 High CPU Usage

jcolonfzenpr — Wed, 04 Jun 2025 10:18:44 GMT

Hello,

After upgrading to version 9.9.1 in my Ontap Sim lab I noticed that now the cluster nodes are with a constant high CPU percentage. I performed several tests by creating a new cluster in both versions 9.8 and 9.9.1. I found that the 9.8 cluster has no high CPU behavior but the 9.9.1 cluster does.

Any change in version 9.9.1?

My environment:
ESXi version = 7.0u2
CPU = Intel Xeon Processor E5-2630 v4
Mem = 128GB

Ontap Sim 9.8 CPU - ESXi:

https://technomyth.zenprsolutions.net/wp-content/uploads/2021/07/ONTAP-SIM-9.8.png

https://technomyth.zenprsolutions.net/wp-content/uploads/2021/07/Ontap-SIM-9.8-stats.png

Ontap Sim 9.9 CPU - ESXi:

https://technomyth.zenprsolutions.net/wp-content/uploads/2021/07/ONTAP-SIM-9.9.1.png

https://technomyth.zenprsolutions.net/wp-content/uploads/2021/07/Ontap-SIM-9.9-stats.png

Any help would be appreciated.

Re: Ontap Sim 9.9 High CPU Usage

pedro_rocha — Mon, 19 Jul 2021 21:17:13 GMT

Hi,

I don't know what is happening. Can you post the output for sysstat -M on each node?

node run -node XXX -command sysstat -M 1

Regards,

Pedro

Re: Ontap Sim 9.9 High CPU Usage

jcolonfzenpr — Tue, 20 Jul 2021 02:20:32 GMT

Hello,

I made several performance captures but I do not see any anomaly. Additionally I upgraded from version 9.8 to 9.9.1 in the cluster that does not have the anomaly and after the upgrade I see the same strange behavior. Both nodes have nothing configured. I think it is a bug!

9.8 Sim upgraded to 9.9.1:

https://technomyth.zenprsolutions.net/wp-content/uploads/2021/07/98_upgraded_to_99.png

As requested:

Ontap 9.8 SIM Node sysstat:

https://technomyth.zenprsolutions.net/wp-content/uploads/2021/07/sysstat-9-8.png

Ontap 9.9.1 Sim Node sysstat:

https://technomyth.zenprsolutions.net/wp-content/uploads/2021/07/sysstat-9-9.png

Thanks!

Re: Ontap Sim 9.9 High CPU Usage

pedro_rocha — Tue, 20 Jul 2021 19:43:00 GMT

Hi,

After the upgrade, did you change the memory allocation for the SIM instances? I saw that they have different requirements:

5.1 GB of RAM till ONTAP 9.8 and 6 GB of RAM from ONTAP 9.9.1 and above, for one instance of the simulator
10.2 GB of RAM till ONTAP 9.8 and 12 GB of RAM from ONTAP 9.9.1 and above, for two instances of the simulator

Regards,

Pedro

Re: Ontap Sim 9.9 High CPU Usage

jcolonfzenpr — Wed, 21 Jul 2021 00:00:54 GMT

Hi,

Both Test VMs have 12GB of RAM. Same high CPU behavior.

Thanks for the help but I will revert back to 9.7px version.

As requested:

PS /home/xxxxxxx> get-vm 'Ontap S*' Name PowerState Num CPUs MemoryGB ---- ---------- -------- -------- Ontap Sim 9.8 PoweredOn 2 12.000 Ontap Sim 9.9 PoweredOn 2 12.000 PS /home/xxxxxxx>