VSAN-Troubleshooting-Reference-Manual

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Diagnostics and Troubleshooting Reference Manual – Virtual SAN Once the full charts view is expanded, what is notable is that the amount of data transmitted and received on the Virtual SAN network is rather small: This is taken from the host where the virtual machine resides. These hosts use 1Gb NICs, which are fully supported by Virtual SAN, but should be dedicated to Virtual SAN traffic. So why is the TxMBps and RxMBps so low when we are clearly wishing to drive far more IOPS than we are achieving? In this scenario, using the Network I/O Control feature of a distributed switch to limit the Virtual SAN network traffic produced this situation. Although somewhat contrived, it is an accurate reflection of the behavior that may be observed in Virtual SAN if the network is suffering from issues. In fact, we had a customer situation where the switch was sending excessive pause frames (in the millions) impacting Virtual SAN traffic and leading to extremely poor latency for the virtual machine workloads (observed via the client and DOM owner views) but no latency issues on the disks view. V M W A R E S T O R A G E B U D O C U M E N T A T I O N / 2 7 0
Diagnostics and Troubleshooting Reference Manual – Virtual SAN When the NIOC limit is lifted from the Virtual SAN traffic, we very quickly begin to see latency, IOPS and bandwidth return to expected values: Root cause: The Virtual SAN network was limited in the number of MB per second that it could send, impacting IOPS and latency. Lesson: Virtual SAN is a distributed storage system that relies heavily on the network between each of the participating hosts. Ensure your network is fully functional. Issues on the network will significantly impact performance. V M W A R E S T O R A G E B U D O C U M E N T A T I O N / 2 7 1
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VSAN-Troubleshooting-Reference-Manual

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