---
title: "VM Disk Performance Chart"
description: "The Disk chart for VMs 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/hyperv_vm_disk.html"
breadcrumb: "User Guide > Hyper-V Monitoring > Microsoft Hyper-V Performance Charts > VM Disk Performance Chart"
dateModified: "2026-10-23"
---

# VM Disk Performance Chart

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

[![VM Disk Performance Chart](images/hyperv_vm_disk_performance_chart.png "VM Disk Performance Chart")](images/hyperv_vm_disk_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>Chart 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 Storage Issues</span></p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Errors/min</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;">Number of virtual storage errors per minute.</p>
    </td>
  </tr>
  <tr style="vertical-align:top">
    <td style="vertical-align:top;">
      <p style="text-align:left;">Flushes/min</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;">Number of virtual storage flush operations per minute.</p>
    </td>
  </tr>
  <tr style="vertical-align:top">
    <td rowspan="3" style="vertical-align:top;">
      <p style="text-align:left;"><span style="font-weight:bold;">Virtual Storage Usage</span></p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Virtual Storage Read</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">KB/s</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Total number of bytes that have been read per second on a virtual storage.</p>
    </td>
  </tr>
  <tr style="vertical-align:top">
    <td style="vertical-align:top;">
      <p style="text-align:left;">Virtual Storage Write</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">KB/s</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Total number of bytes that have been written per second on a virtual storage.</p>
    </td>
  </tr>
  <tr style="vertical-align:top">
    <td style="vertical-align:top;">
      <p style="text-align:left;">Virtual Storage Usage</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">KB/s</p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">Rate at which bytes have been read and written per second on a virtual storage.</p>
    </td>
  </tr>
  <tr style="vertical-align:top">
    <td rowspan="3" style="vertical-align:top;">
      <p style="text-align:left;"><span style="font-weight:bold;">Virtual Storage IOPS</span></p>
    </td>
    <td style="vertical-align:top;">
      <p style="text-align:left;">IOPS</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 and write operations per second to a virtual storage.</p>
    </td>
  </tr>
  <tr style="vertical-align:top">
    <td style="vertical-align:top;">
      <p style="text-align:left;">Reads/sec</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;">Total number of read operations issued per second to a virtual storage.</p>
    </td>
  </tr>
  <tr style="vertical-align:top">
    <td style="vertical-align:top;">
      <p style="text-align:left;">Writes/sec</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;">Total number of write operations issued per second to a virtual storage.</p>
    </td>
  </tr>
</table>