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Chapter 2. Administering the Resources
2.1. 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.
2.1.1. 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.
2.1.1.1. Creating a Storage Quality of Service Entry
Procedure
-
Click
. - Click a data center’s name. This opens the details view.
- Click the QoS tab.
- Under Storage, click New.
- Enter a QoS Name and a Description for the quality of service entry.
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.
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.
- Click .
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.
2.1.1.2. Removing a Storage Quality of Service Entry
Remove an existing storage quality of service entry.
Procedure
-
Click
. - Click a data center’s name. This opens the details view.
- Click the QoS tab.
- Under Storage, select a storage quality of service entry and click Remove.
- Click .
If any disk profiles were based on that entry, the storage quality of service entry for those profiles is automatically set to [unlimited]
.
2.1.2. Virtual Machine Network Quality of Service
Virtual machine network quality of service is a feature that allows you to create profiles for limiting both the inbound and outbound traffic of individual virtual network interface controllers. With this feature, you can limit bandwidth in a number of layers, controlling the consumption of network resources.
2.1.2.1. Creating a Virtual Machine Network Quality of Service Entry
Create a virtual machine network quality of service entry to regulate network traffic when applied to a virtual network interface controller (vNIC) profile, also known as a virtual machine network interface profile.
Creating a Virtual Machine Network Quality of Service Entry
-
Click
. - Click a data center’s name. This opens the details view.
- Click the QoS tab.
- Under VM Network, click New.
- Enter a Name for the virtual machine network quality of service entry.
- Enter the limits for the Inbound and Outbound network traffic.
- Click .
You have created a virtual machine network quality of service entry that can be used in a virtual network interface controller.
2.1.2.2. Settings in the New Virtual Machine Network QoS and Edit Virtual Machine Network QoS Windows Explained
Virtual machine network quality of service settings allow you to configure bandwidth limits for both inbound and outbound traffic on three distinct levels.
Field Name | Description |
---|---|
Data Center | The data center to which the virtual machine network QoS policy is to be added. This field is configured automatically according to the selected data center. |
Name | A name to represent the virtual machine network QoS policy within the Manager. |
Inbound | The settings to be applied to inbound traffic. Select or clear the Inbound check box to enable or disable these settings.
|
Outbound | The settings to be applied to outbound traffic. Select or clear the Outbound check box to enable or disable these settings.
|
To change the maximum value allowed by the Average, Peak, or Burst fields, use the engine-config
command to change the value of the MaxAverageNetworkQoSValue
, MaxPeakNetworkQoSValue
, or MaxBurstNetworkQoSValue
configuration keys. You must restart the ovirt-engine service for any changes to take effect. For example:
# engine-config -s MaxAverageNetworkQoSValue=2048 # systemctl restart ovirt-engine
2.1.2.3. Removing a Virtual Machine Network Quality of Service Entry
Remove an existing virtual machine network quality of service entry.
Procedure
-
Click
. - Click a data center’s name. This opens the details view.
- Click the QoS tab.
- Under VM Network, select a virtual machine network quality of service entry and click Remove.
- Click .
2.1.3. Host Network Quality of Service
Host network quality of service configures the networks on a host to enable the control of network traffic through the physical interfaces. Host network quality of service allows for the fine tuning of network performance by controlling the consumption of network resources on the same physical network interface controller. This helps to prevent situations where one network causes other networks attached to the same physical network interface controller to no longer function due to heavy traffic. By configuring host network quality of service, these networks can now function on the same physical network interface controller without congestion issues.
2.1.3.1. Creating a Host Network Quality of Service Entry
Create a host network quality of service entry.
Procedure
-
Click
. - Click a data center’s name. This opens the details view.
- Click the QoS tab.
- Under Host Network, click New.
- Enter a Qos Name and a description for the quality of service entry.
- Enter the desired values for Weighted Share, Rate Limit [Mbps], and Committed Rate [Mbps].
- Click .
2.1.3.2. Settings in the New Host Network Quality of Service and Edit Host Network Quality of Service Windows Explained
Host network quality of service settings allow you to configure bandwidth limits for outbound traffic.
Field Name | Description |
---|---|
Data Center | The data center to which the host network QoS policy is to be added. This field is configured automatically according to the selected data center. |
QoS Name | A name to represent the host network QoS policy within the Manager. |
Description | A description of the host network QoS policy. |
Outbound | The settings to be applied to outbound traffic.
|
To change the maximum value allowed by the Rate Limit [Mbps] or Committed Rate [Mbps] fields, use the engine-config
command to change the value of the MaxAverageNetworkQoSValue
configuration key. You must restart the ovirt-engine service for the change to take effect. For example:
# engine-config -s MaxAverageNetworkQoSValue=2048 # systemctl restart ovirt-engine
2.1.3.3. Removing a Host Network Quality of Service Entry
Remove an existing network quality of service entry.
Procedure
-
Click
. - Click a data center’s name. This opens the details view.
- Click the QoS tab.
- Under Host Network, select a host network quality of service entry and click Remove.
- Click when prompted.
2.1.4. CPU Quality of Service
CPU quality of service defines the maximum amount of processing capability a virtual machine can access on the host on which it runs, expressed as a percent of the total processing capability available to that host. Assigning CPU quality of service to a virtual machine allows you to prevent the workload on one virtual machine in a cluster from affecting the processing resources available to other virtual machines in that cluster.
2.1.4.1. Creating a CPU Quality of Service Entry
Create a CPU quality of service entry.
Procedure
-
Click
. - Click a data center’s name. This opens the details view.
- Click the QoS tab.
- Under CPU, click New.
- Enter a QoS Name and a Description for the quality of service entry.
-
Enter the maximum processing capability the quality of service entry permits in the Limit (%) field. Do not include the
%
symbol. - Click .
You have created a CPU quality of service entry, and can create CPU profiles based on that entry in clusters that belong to the data center.
2.1.4.2. Removing a CPU Quality of Service Entry
Remove an existing CPU quality of service entry.
Procedure
-
Click
. - Click a data center’s name. This opens the details view.
- Click the QoS tab.
- Under CPU, select a CPU quality of service entry and click Remove.
- Click .
If any CPU profiles were based on that entry, the CPU quality of service entry for those profiles is automatically set to [unlimited]
.