Change resource limits for AHV resource types
Nutanix AHV resource limits control the number of simultaneous backups that can be performed on Nutanix AHV resources. The settings apply to all NetBackup policies for the currently selected primary server.
Resource limits available for Nutanix AHV:
Backup Jobs per Host
Backup Jobs per AHV Cluster
Backup Jobs per Storage Container
Snapshot Jobs per AHV Cluster
Note:
For each resource, the default value is 0 (No limit).
To set resource limits for Nutanix AHV resources
- On the left, click Nutanix AHV.
- On the top right, click AHV settings > Resource limits.
For each resource, the default value is 0 (No limit).
Note:
The Snapshot Jobs per AHV Cluster option sets a limit for the number of simultaneous snapshot operations per cluster. It only applies during the snapshot creation phase of a backup. It does not control the number of simultaneous backup jobs. This setting can control the effect that multiple snapshot operations have on the AHV cluster. To override the global snapshot setting for that AHV cluster, add a specific AHV cluster.
- Locate the AHV resource that you want to change and then, click Edit.
- Choose from the following options.
Set a global limit for an AHV resource type.
Locate the Global setting and select the Limits value that you want to apply.
This value limits the number of simultaneous backups that are performed for the resource type.
Set a limit for a specific AHV resource.
Click Add.
From the list, select the resource.
Select the Limits value that you want to apply.
This value limits the number of simultaneous backups that are performed for the selected resource.
The following example shows a global limit of 2 for all AHV clusters and a limit of 1 for the selected AHV cluster.
- Click Save.
Limits indicates the number of simultaneous backups that can be performed for the resource type. This value is the global limit. The Override value indicates how many resources have any limits that are different from the global limit.
Note: After you set resource limits the limits do not take effect until a few jobs run.
To reset the resource limits for all AHV resources
- Click Reset default values to remove all the overrides and set all global AHV resource limits to their default values.
Consider the following example:
The Nutanix cluster has two nodes.
Each node hosts 40 VMs, so there are 80 VMs in the cluster.
The policy has 20 VMs.
When NetBackup connects to the Nutanix environment for backup, it makes one connection per VM. If no resource limit is set, there are a total of 160 concurrent jobs that run (80 snapshot + 80 backup). See this article.
Nutanix recommends up to 20 connections concurrently per CVM in the cluster, which means that 20 VMs per node are backed up concurrently. In our example, you can enforce a limit of 20 connections with the following settings:
Set any limits based on the characteristics of the storage technology. | |
Snapshot Jobs per Cluster |
When a backup begins, the Activity monitor displays the jobs as follows:
Snapshot jobs: 20
Active jobs: 10 (snapshot jobs and their backup jobs)
Queued jobs: 10
After the active snapshot jobs complete, the queued snapshot jobs become active.