---
title: "Virtual Disks Performance Chart"
description: "The Virtual Disks chart displays historical statistics for partitions of all disks on the selected VM. The following table provides information on predefined views and counters."
canonical: "https://helpcenter.veeam.com/docs/one/userguide/vsphere_virtual_disk.html"
breadcrumb: "User Guide > VMware vSphere Monitoring > VMware vSphere Performance Charts > Virtual Disks Performance Chart"
dateModified: "2026-10-23"
---

# Virtual Disks Performance Chart

The **Virtual Disks** chart displays historical statistics for partitions of all disks on the selected VM.

[![Virtual Disks Performance Chart](images/vmware_virtual_disks_performance_chart.png "Virtual Disks Performance Chart")](images/vmware_virtual_disks_performance_chart.png){.toggle scale=50}

The following table provides information on predefined views and counters.

<table class="Blue_Table">
  <tr style="vertical-align:top">
    <th>
      <p>Chat View</p>
    </th>
    <th>
      <p>Counter</p>
    </th>
    <th>
      <p>Measurement Unit</p>
    </th>
    <th>
      <p>Description</p>
    </th>
  </tr>
  <tr style="vertical-align:top">
    <td rowspan="2" style="vertical-align:top;">
      <p style="text-align:left;"><span style="font-weight:bold;">Virtual Disks IOPS</span></p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Read I/O</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Number</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Average number of read operations issued per second to a virtual disk.</p>
    </td>
  </tr>
  <tr style="vertical-align:top">
    <td style="vertical-align:top;">
      <p style="text-align:left;">Write I/O</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Number</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Average number of write operations issued per second to a virtual disk.</p>
    </td>
  </tr>
  <tr style="vertical-align:top">
    <td rowspan="2" style="vertical-align:top;">
      <p style="text-align:left;"><span style="font-weight:bold;">Virtual Disks Usage Rates</span></p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Read Rate</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">MB/s</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Rate at which data is read from a virtual disk.</p>
    </td>
  </tr>
  <tr style="vertical-align:top">
    <td style="vertical-align:top;">
      <p style="text-align:left;">Write Rate</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">MB/s</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Rate at which data is written to a virtual disk.</p>
    </td>
  </tr>
  <tr style="vertical-align:top">
    <td rowspan="2" style="vertical-align:top;">
      <p style="text-align:left;"><span style="font-weight:bold;">Virtual Disks Latency</span></p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Read Latency</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Millisecond</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Average amount of time that a read operation from a virtual disk takes.</p>
    </td>
  </tr>
  <tr style="vertical-align:top">
    <td style="vertical-align:top;">
      <p style="text-align:left;">Write Latency</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Millisecond</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Average amount of time that a write operation to a virtual disk takes.</p>
    </td>
  </tr>
</table>