VSAN-Troubleshooting-Reference-Manual

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Diagnostics and Troubleshooting Reference Manual – Virtual SAN Navigating VSAN Observer – VSAN Disks The next tab is the VSAN Disks view. As mentioned previously, this is where disk bottlenecks can be observed, which in turn might be impacting VM performance. All the same counters and metric observed in the VSAN client view are shown here. However, where the VSAN Client gives the client side view (nodes with VMs requesting information), VSAN Disks can be thought of as the server side view (nodes where requested information resides). The top-most layer in Virtual SAN is the VSAN Client layer. Beneath the VSAN Client layer is the VSAN Disks layer. This layer is responsible for all of the physical disks in each host. The VSAN Disks view shows the VSAN statistics of the physical disk layer of each host. This is the layer that actually serves I/O from local disks to different nodes in the cluster. Due to the distributed nature of VSAN the physical disks of one host may be accessed by VMs on all hosts in the VSAN cluster. Because a VM may not reside on the same node as it’s storage on Virtual SAN, the Virtual SAN disks layer is shown from the node where the data resides, and it serves the data over the network to the requesting node (client). To correlate the client view with a disk view, you would need to use the VMs view, which will be discussed shortly. The VSAN Disks tab shows statistics related to physical disks in each host, so it includes all disk group performance from that host in a single view. This tab provides a reasonable insight into the performance of the physical disks in every host in the 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 1 0
Diagnostics and Troubleshooting Reference Manual – Virtual SAN This view also allows administrators to determine if there is any contention on any of the physical disks (and by extrapolation, any disk groups) that make up the overall Virtual SAN cluster. Note that the statistics shown are purely the physical disk layer (including the caching layer) but do not include any other Virtual SAN overhead (e.g. networking or Virtual SAN RAID). If virtual machine (VSAN Client) latency is an issue, but there is no latency visible in this VSAN Disk view, then the high latency may be due to network issues, which can be further investigated via the “Network” view. VSAN Disks – Full size graphs Click on any point in the chart to have the values displayed on the right hand side. If the VSAN Disks view shows physical disk contention across a majority of hosts, then this may indicates that the workload run by VMs is collectively higher than the VSAN cluster can handle. In that case, either reduce the storage workload, or check 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 1 1
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