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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

Creating a Storage Quality of Service Entry

  1. Click ComputeData Centers.
  2. Click a data center’s name to open the details view.
  3. Click the QoS tab.
  4. Under Storage, click New.
  5. Enter a QoS Name and a Description for the quality of service entry.
  6. Specify the Throughput quality of service by clicking one of the radio buttons:

    • None
    • Total - Enter the maximum permitted total throughput in the MB/s field.
    • Read/Write - Enter the maximum permitted throughput for read operations in the left MB/s field, and the maximum permitted throughput for write operations in the right MB/s field.
  7. Specify the input and output (IOps) quality of service by clicking one of the radio buttons:

    • None
    • Total - Enter the maximum permitted number of input and output operations per second in the IOps field.
    • Read/Write - Enter the maximum permitted number of input operations per second in the left IOps field, and the maximum permitted number of output operations per second in the right IOps field.
  8. 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.

Removing a Storage Quality of Service Entry

  1. Click ComputeData Centers.
  2. Click a data center’s name to open the details view.
  3. Click the QoS tab.
  4. Under Storage, select a storage quality of service entry and click Remove.
  5. Click OK.

If any disk profiles were based on that entry, the storage quality of service entry for those profiles is automatically set to [unlimited].