Virtualization limits for Red Hat Enterprise Virtualization

Updated -

The following limits apply to Red Hat Enterprise Virtualization. Red Hat also offers Red Hat Enterprise Linux with KVM virtualization, which offers virtualization for low-density Red Hat Enterprise Linux environments. To see limits for Red Hat Enterprise Linux with KVM virtualization, please see "Virtualization limits for Red Hat Enterprise Linux with KVM".

  Red Hat Enterprise Virtualization 2 Red Hat Enterprise Virtualization 3 Red Hat Virtualization 4
Maximum number of concurrently running virtual guests Unlimited Unlimited Unlimited
Maximum number of virtual CPUs in virtualized guest 16 160 288 for 4.0-4.2
384 for 4.2-4.3
Maximum memory in virtualized guest 512 GB1 2 TB1 4 TB1
Minimum memory in virtualized guest 512 MB 512 MB N/A

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 will be 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.
  • For limits using KVM virtualization included with Red Hat Enterprise Linux, please see "Virtualization limits for Red Hat Enterprise Linux with KVM".
  • Guest Operating systems will 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".
  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.

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7 Comments

Can this article be improved (or another article created) to provide documentation around the physical maximums? For example, how many hosts per cluster are supported? How many clusters per datacenter? How many CPU / host? How much RAM / host? How many LUNS (FC/iSCSI) per host?

Hi John
Many of those limits are reported in the Technical Guide, for example, for 3.5 you can find it at https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Virtualization/3.5/html-single/Technical_Guide/index.html#Minimum_requirements_and_supported_limits

Where it lists limits of ram, storage, etc.

Hi ,
I think this is not correct documentation --> "A maximum of 2 TB of RAM is supported."

Saludos
Roberto D.

Please update this KB with the RHEV 4 Limits.

Please update this KB with the RHEV 4 Limits.

There is a new document for RHV 4.1 with comprehensive information: Red Hat Virtualization Manager Limitations At the moment when I am writing it is still not finished but RH is conducting very thorough performance/limitation tests. When they finish, it will be the most accurate and precise document.

max vCPUs is not accurate. RHV 4.2 has a limit of 288, and 4.2-4.3 has 384