VSAN-Troubleshooting-Reference-Manual

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Diagnostics and Troubleshooting Reference Manual – Virtual SAN Navigating VSAN Observer - VSAN (More) – Congestion Virtual SAN might artificially introduce latencies to slow down writes to the flash device so that write buffers can be freed up. Obviously, if congestion begins to occur, higher latencies will also be observed. Under normal circumstances, congestion will be at zero. VSAN (More) – Congestion – Full graphs A full graph of congestion shows where it is being incurred. Of benefit to VMware support staff only, but shown here for completeness. No congestion in this scenario, which is what one would expect on a normal 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 3 8
Diagnostics and Troubleshooting Reference Manual – Virtual SAN Navigating VSAN Observer - VSAN (More) – Distribution The Distribution tab shows how well Virtual SAN is balancing the objects (VM Home Namespaces, VMDKs, delta disks) and components (stripes, replicas, witnesses) across hosts in the cluster. The components are distributed across hosts in the cluster. Each host in version 5.5 has a 3000 component limit. In Virtual SAN 6.0, hosts with a v1 on-disk version continue to have the 3000 component limit, but those with a v2 on-disk format have a 9000 component limit per host. Balancing components across the cluster is an important side effect of balancing for performance and space. Components includes both I/O components as well as witnesses. IO Components excludes witnesses and just showns how I/O components are balanced. DOM owners are in-memory states inside VSAN, showing the distribution of object owners around the cluster. This is something that the user can't control. DOM Clients are in-memory states inside VSAN, showing the distribution of object clients around the cluster. This is something that the user can't control. DOM Colocated – are in-memory states inside VSAN, showing where both the client and owner are co-located on the same host. This is something that the user can't control. Distribution metrics are not tuneable. The information is shown here is primarily for the benefit of VMware Support. 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 3 9
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