# System Requirements for Red Hat Virtualization Access Nodes

To protect Red Hat Virtualization VMs, you must have at least one access node (also called proxies) in the RHV data center that contains the VMs. Red Hat guest tools must be installed on the access node. Access nodes manage backup and restore operations for guest VMs in your environment, without the need to install agents on guest VMs.

## Deployment Considerations

### Tiers Based on Service Level Agreements (SLAs)

Different virtual machines (VMs) can have different backup and recovery options that are defined in a service level agreement (SLA) for each class of VM. For example:

- High transaction VMs that provide customer application support might require multiple daily backups with the requirement to recover virtual machines quickly.

- User VMs might need the ability to recover specific files and folders on a daily basis.

- Development and test VMs might only need weekly backups or the ability to recover to predefined states.

To manage different SLAs, you can create a separate subclient for each class of VM. Each subclient can have its own storage policy, backup schedule, and recovery options.

### Data Recovery Considerations

The frequency of backups should be based on your requirements for data recovery. For example:

- To determine backup frequency, determine how long the maximum window for potential loss can be. For example, if your policy calls for no more than an hour's work to be lost in the event of a virtual machine failure, hourly backups are required.

- If immediate recovery is a priority, you can restore a copy of a virtual machine that is frequently updated based on incremental backups.

## System Requirements for Access Nodes

### Linux Access Nodes

For Linux proxies, disable automatic activation of volumes to avoid issues with HotAdd operations during backup and recovery. For more information, see Disabling Automatic Activation of Volumes for a Linux Proxy.

- Oracle Linux version 8.x, 9.x

- RHEL versions 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8.0, 8.1, 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.10, or 9.x

  Note

  For a machine that runs RHEL 8.x, to install operating system packages that are required to enable automatic installation of Mono, register the machine with Red Hat.

### Windows Access Nodes

- Microsoft Windows Server 2025 x64 Editions (Standard, DataCenter, and Core)

- Microsoft Windows Server 2022 x64 Editions (Standard, DataCenter, and Core)

- Microsoft Windows Server 2019 (Standard, Datacenter) (64-bit only) x64 Editions (Standard, DataCenter, and Core)

- Microsoft Windows Server 2016 x64 Editions (Standard, DataCenter, and Core)

## Related Topics

For more detailed requirements, see System Requirements for Virtual Server Agent with Red Hat Enterprise Virtualization.

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