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bright-wall-24452

04/24/2023, 7:56 AM
Hi Rancher Team I deploy harvester with six nodes. My host network speed is faster than VM. I am trying to modify engine pod resource to 20% percent,but it's useless.I want to know How to improve VMs performance.
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narrow-egg-98197

04/24/2023, 4:40 PM
Can you provide more information about the engine pod resource reduction you mentioned? Is the engine means longhorn-engine? https://github.com/longhorn/longhorn-engine
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bright-wall-24452

04/25/2023, 2:34 AM
Hi Ray! The engine pod is instance-manager-e***. It includes tgtd process and engine controller.
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narrow-egg-98197

04/25/2023, 6:18 AM
Got it, I might think you can refer to here to adjust the resource that allocate to engine pod.
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bright-wall-24452

04/25/2023, 7:18 AM
Yeah~ I am trying to adjust the resource.But it is useless.At the same time, I find When I start a vm, disk I/O is very smooth. In contrast, disk I/O performance degrade.It's only 1/3 of what was expected.
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narrow-egg-98197

05/02/2023, 3:33 AM
Hi @bright-wall-24452, thank you for response. I would like to ask further information about the context. • Are the I/O performance benchmark results you mention compared to your local disk? • Does the CPU/Memory reach the upper bound?
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bright-wall-24452

05/03/2023, 12:03 PM
Yeah~ Thank you for your response. The I/O performance benchmark results are the local disk. That is ISCSI. The CPU/Memory reach Approximately 300%. My host has 80 cores. I found when my host has 256 cores,The performance of I/O has been improved.
@narrow-egg-98197 Hi !How Can I join team to develop local storage (like qcow2 format). I found a problem When the host (80 cores) network speed is greater than the performance of the ISCSI storage, ISCSI is a bottleneck.
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narrow-egg-98197

05/06/2023, 7:07 AM
@bright-wall-24452 Sure, it is very welcome to have contribute from community. i think you can create a issue ticket in https://github.com/longhorn/longhorn/issues, then having a pull request to improve that.