Supported Limits for Red Hat Virtualization

Introduction

These maximums and minimums are based on performance testing of Red Hat Virtualization (RHV) 4.x and Red Hat Enterprise Virtualization (RHEV) 3.x. as a large-scale environment.

To operate Red Hat Virtualization as a large-scale environment, apply the recommendations in ​​Guidelines for Large Deployments of Red Hat Virtualization​​.

Red Hat Virtualization 4.x Limits

The following limits apply to Red Hat Virtualization (RHV) 4.x

Virtual Machine Maxumums

• Maximum concurrently running virtual guests: Unlimited
• Maximum virtual CPUs per virtualized guest:

• 288 for RHV 4.0-4.1
• 384 for RHV 4.2-4.3

• Maximum memory in virtualized guest: 4 TB1
• Minimum memory in virtualized guest: N/A

1. Supports the maximum supported memory per VM in the host, all of which may be allocated to the virtualized guest. 32-bit guests with Physical Address Extension (PAE) support will only be able to access 64 GB. This is a virtual hardware limitation.

Host (Hypervisor) Maximums

• Logical CPUs (cores/threads): 768
• RAM: 12 TB
• Number of hosted VMs: 250
• Simultaneous live migrations: 2 incoming, 2 outgoing ​​more​​
• Live migration bandwidth: Default to 52 MiB (~436 Mb) per migration when using the legacy migration policy. Other policies use adaptive throughput values based on the speed of the physical device. Live migration bandwidth may be limited using QoS policies.

Self-hosted RHV Manager Maximums

• Number of SHE cluster nodes: 7

RHV Manager Logical Entities Maxumums

• Datacenter

• Maximum datacenter count: 400
• Maximum host count: 400 supported, 500 tested
• Maximum VM count: 4000 supported, 5000 tested

• Cluster

• Maximum cluster count: 400

• Network

• Logical networks/cluster: 300
• SDN/external networks: 2600 tested, no enforced limit

• Storage

• Maximum domains: 50 supported, 70 tested
• Hosts per domain: No limit
• Logical volumes per block domain (​​more​​): 1500
• Maximum number of LUNs (​​more​​): 300
• Maximum disk size: 500 TiB (limited to 8 TiB by default)

Other

• SPM - Concurrent activities (metadata operations, storage live migration, etc.): 10

Red Hat Enterprise Virtualization 3.x

• Maximum number of concurrently running virtual guests: Unlimited
• Maximum number of virtual CPUs in virtualized guest: 160
• Maximum memory in virtualized guest: 2 TB1
• Minimum memory in virtualized guest: 512 MB

Notes

• Supported limits reflect the current state of system testing by Red Hat and its partners. Systems exceeding these supported limits may be included in the Hardware Catalog after joint testing between Red Hat and its partners. If they exceed the supported limits posted here, entries in the Hardware Catalog are fully supported. In addition to supported limits reflecting hardware capability, there may be additional limits under the Red Hat Enterprise Linux subscription terms. Supported limits are subject to change based on ongoing testing activities.
• These limits do not apply to Red Hat Enterprise Linux (RHEL) with KVM virtualization, which offers virtualization for low-density environments. Instead, see ​​"Virtualization limits for RHEL with KVM"​​.
• Guest Operating systems have different minimum memory requirements. Virtual Guest memory can be allocated as small as required.
• More specific RHV limitations can be found in ​​"Planning and Prerequisites Guide: Requirements"​​.