Chapter 3. Quality of Service

Red Hat Virtualization allows you to define quality of service entries that provide fine-grained control over the level of input and output, processing, and networking capabilities that resources in your environment can access. Quality of service entries are defined at the data center level and are assigned to profiles created under clusters and storage domains. These profiles are then assigned to individual resources in the clusters and storage domains where the profiles were created.

3.1. Storage Quality of Service

Storage quality of service defines the maximum level of throughput and the maximum level of input and output operations for a virtual disk in a storage domain. Assigning storage quality of service to a virtual disk allows you to fine tune the performance of storage domains and prevent the storage operations associated with one virtual disk from affecting the storage capabilities available to other virtual disks hosted in the same storage domain.

3.1.1. Creating a Storage Quality of Service Entry

Create a storage quality of service entry.

Procedure 3.1. Creating a Storage Quality of Service Entry

  1. Click the Data Centers resource tab and select a data center.
  2. Click QoS in the details pane.
  3. Click Storage.
  4. Click New.
  5. Enter a name for the quality of service entry in the QoS Name field.
  6. Enter a description for the quality of service entry in the Description field.
  7. Specify the throughput quality of service:
    1. Select the Throughput check box.
    2. Enter the maximum permitted total throughput in the Total field.
    3. Enter the maximum permitted throughput for read operations in the Read field.
    4. Enter the maximum permitted throughput for write operations in the Write field.
  8. Specify the input and output quality of service:
    1. Select the IOps check box.
    2. Enter the maximum permitted number of input and output operations per second in the Total field.
    3. Enter the maximum permitted number of input operations per second in the Read field.
    4. Enter the maximum permitted number of output operations per second in the Write field.
  9. Click OK.
You have created a storage quality of service entry, and can create disk profiles based on that entry in data storage domains that belong to the data center.

3.1.2. Removing a Storage Quality of Service Entry

Remove an existing storage quality of service entry.

Procedure 3.2. Removing a Storage Quality of Service Entry

  1. Click the Data Centers resource tab and select a data center.
  2. Click QoS in the details pane.
  3. Click Storage.
  4. Select the storage quality of service entry to remove.
  5. Click Remove.
  6. Click OK when prompted.
You have removed the storage quality of service entry, and that entry is no longer available. If any disk profiles were based on that entry, the storage quality of service entry for those profiles is automatically set to [unlimited].