VMware Aria Operations 8.17.1

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vSAN ESA Performance Dashboard
Last Updated February 20, 2025

The vSAN ESA (Express Storage Architecture) Performance dashboard provides an overview of the performance issues related to your vSAN clusters. The dashboard displays the read and write latency issues that affect the vSAN clusters present in your environment. You can use this dashboard to identify and troubleshoot performance issues related to Contention and Utilization across VMs that are part of the vSAN cluster.

How to Use the Dashboard

The
vSAN ESA Performance
 dashboard is organized into sections for ease of use.
  • Cluster Analysis
    The
    vSAN ESA Clusters
     widget lists all the vSAN clusters, starting with cluster with the highest VM disk latency. By default, the widget displays data from the last 24 hours.
    The first column displays if the distribution of disk latency is experienced by all the VMs in the cluster. You can expect a majority of the VMs to experience latency that matches your expectation.
    The second column displays if any of the vSAN kernel modules have to wait for CPU. Expect this number to be near 0% and below 1%, as vSAN should not be waiting for CPU time.
    The third column displays if any of the vSAN clusters are dropping packets in the vSAN network (not the VM network). vSAN relies on the network to keep the cluster in-sync. This number should be near 0% and less than 1%.
    Select a cluster to investigate further. The VM latency distribution is automatically displayed.
  • Contention
    You can view various disk-related contention counters of the cluster from the
    Contention
     widget.
  • Utilization
    Contention metrics are complemented by utilization metrics. A large block size can result in high throughput in a relatively low IOPS. If you see a large block size when you are not expecting it, investigate which applications are using it.
  • Configuration
    You can view the configuration details such as storage type, number of VMs, ESXi, Storage Pools, Physical Disks of the selected vSAN cluster.
  • Storage Pools
    You can view the configuration, contention, and utilization details of the Storage Pool for the selected vSAN cluster.
  • Physical Disks
    You can view the configuration, contention, and utilization details of the Physical Disks for the selected vSAN cluster.
  • Related Objects to Selected vSAN Cluster
    You can view the details of the related objects for the selected vSAN cluster.

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