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Very little I/O, no congestion,but high latency

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My environment is vsan6.7, all flash. Recently, the write latency of a virtual machine is very large, and it will affect the delay of the entire cluster, but the strange thing is that I / Ø is very small whether it is this virtual machine or the entire cluster. And if it is only a write test of a file copy, there will be no congestion and high latency. What is the reason for this? And the latency of a virtual machine is high, why does the delay of the entire cluster increase?

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