Metric unit for Throughput and the Latency

[PavanHCL]

What is the unit for Latency in vSAN? I am using healthPort.vsanPerfQueryPerf() method call to get the performance metrics and the latency metric value is 1000 times more than the value in vCenter. In vCenter metric unit is ms.

And, what is the Throughput(IOPS Read/Write) unit in vSAN? There is a discrepancy in throughput values in vCenter and vSAN.

[PavanHCL]

Latency unit is microsecond or millisecond in vSAN?

[tayfundeger]

Hi,

I don't quite understand the question. Are you having a performance problem and want to solve it? HCIBench and VSAN ObServer can help you. These 2 products will help you in performance analysis of the infrastructure. You can see throughput value in "KB" and latency value in "ms" on VSAN.

IOPS - IO’s Per Second. Effectively the number of IO requests per second. Very often, this is the number that most storage providers will provide.

Latency - This is the time taken for each corresponding IO to complete. It is not often provided, but good storage providers often are fairly transparent with this.

Throughput - Measure of data bandwidth in MB/s or GB/s. Throughput is basically derived from the number of IOPS x average block size of payload. Most if not all vendors, often use 4k blocks as their benchmark block size.

HCIBench | VMware Flings

[PavanHCL]

Hi

we are not having any performance issue. I was comparing vSAN metric values with the values present in vCenter. In vCenter latency is measured in milliseconds. latency value in vSAN is 1000times more than the vCenter latency. I feel in vSAN latency is measured in micro seconds.We have to prepare some report with these values, there is some discrepancy in the latency values. Just for he confirmation of latency unit in vSAN,I have posted it in the forum.

[tayfundeger]

Hi,

Okey I just got it. Yeah, you see it as microsecond. So I checked my own VSAN infrastructure. I saw values like 2700ms and 6000. This value is not milliseconds.

Thanks.