VSAN-Troubleshooting-Reference-Manual

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Diagnostics and Troubleshooting Reference Manual – Virtual SAN Now the problem manifests itself. The customer notices that IOPS and throughput have begun to reduce significantly, while latency has risen. Notice that latency has now been flagged as red on cs-ie-h04. The next place to check is the VSAN Disks view, and see whether latency is occurring at the magnetic disk or flash layers. 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 6 8
Diagnostics and Troubleshooting Reference Manual – Virtual SAN There are clearly no latency issues here. However note again the significant drop in IOPS from approximately 2,000 in steady state to around 300 now. Perhaps another clue as to what is happening here? Why would Virtual SAN be driving only 20% of the number of IOPS that it was previously able to drive with this workload? One final place to check is the DOM Owner view. This will tell us whether VSAN is seeing any latency at this layer: The answer is yes; we are also seeing latency at the DOM owner layer, the layer that is responsible for managing RAID configurations. Let’s recap on what we have observed. The client, in essence the virtual machine, is seeing high latency. The owner, responsible for providing network access to the storage, is seeing latency across the distributed components of the object. However the physical disk layer is no seeing any latency issues. This might now be a network issue, and it is now worth visiting the network view to see if there are any errors or issues with the network. The default view doesn’t offer much information other than telling us how much the physical NIC has transmitted and received and that there are no serious errors with the physical NICs. If we go to the full graph view in networking, and especially the vmknic view (this is the Virtual SAN network), we see something interesting. Again, this virtual machine has a VM Storage policy of NumberOfFailuresToTolerate set to 1, meaning that its storage components are replicated across two separate hosts in the Virtual SAN cluster. 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 6 9
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VSAN-Troubleshooting-Reference-Manual

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