Dell EMC VxRAIL vCENTER Technical manual

1 | vCenter Planning Guide
© 2019 Dell Inc. or its subsidiaries.
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DELL EMC VxRAIL™ vCENTER SERVER
PLANNING GUIDE
ABSTRACT
This planning document provides guidance for various vCenter
Server deployment options supported on VxRail Appliances.
February 2019
WHITE PAPER

2 | vCenter Planning Guide
© 2019 Dell Inc. or its subsidiaries.
TABLE OF CONTENTS
Intended Use and Audience........................................................................................................................................................................ 3
vCenter Server.................................................................................................................................................................................................. 3
vCenter Server with an Embedded PSC ........................................................................................................................................... 3
vCenter Server with an External PSC................................................................................................................................................ 3
VxRail Appliances............................................................................................................................................................................................ 4
VxRail vCenter Server Options............................................................................................................................................................. 4
VxRail vCenter Server.............................................................................................................................................................................. 5
Use Cases.................................................................................................................................................................................................. 5
Limitations............................................................................................................................................................................................... 5
Customer Supplied vCenter Server.................................................................................................................................................... 5
Use Cases.................................................................................................................................................................................................. 6
Limitations............................................................................................................................................................................................... 6
Notes .......................................................................................................................................................................................................... 6
VMware vSphere Recommended Topologies for vCenter Server ............................................................................................. 7
VxRail vCenter Server Deployment Details .......................................................................................................................................10
VxRail vCenter Server............................................................................................................................................................................10
Requirements.......................................................................................................................................................................................10
Customer Supplied vCenter Server..................................................................................................................................................10
Requirements.......................................................................................................................................................................................10
Conclusion ........................................................................................................................................................................................................12

3 | vCenter Planning Guide
© 2019 Dell Inc. or its subsidiaries.
Intended Use and Audience
This guide discusses various VMware vCenter Server™deployment scenarios supported to manage your
VxRail Clusters. It is intended for customers, Dell EMC Sales Teams and field engineers involved in selling,
planning and installing VxRail, including Dell EMC sales and support personnel.
vCenter Server
vCenter Server is the centralized platform for managing a VMware environment. It is the primary point of
management for both server virtualization and vSAN and is the enabling technology for advanced capabilities
such as vMotion, Distributed Resource Scheduler (DRS) and HA. vCenter scales to enterprise levels where a
single vCenter can support up to 1000 hosts (VxRail nodes) and 10,000 virtual machines. vCenter supports a
logical hierarchy of datacenters, clusters, and hosts, which allow resources to be segregated by use cases or
lines of business and allow resources to be moved as needed dynamically. This is all done from a single
interface.
vSphere 6.0 introduced vCenter Server with embedded Platform Services Controller (PSC) as well as vCenter
Server with an external PSC. The following components are included in the vCenter Server installations:
•The PSC group of infrastructure services contains vCenter Single Sign-On, License service, Lookup
Service, and VMware Certificate Authority.
•The vCenter Server group of services contains vCenter Server, vSphere Web Client, Inventory Service,
vSphere Auto Deploy, vSphere ESXi Dump Collector, VMware vSphere Syslog Collector on Windows
and VMware Sphere Syslog Service for the vCenter Server Appliance.
vCenter Server with an Embedded PSC
vCenter Server with an External PSC
For details, refer to vCenter Server Installation and Setup for VxRail 4.7.0+, vSphere Installation and Setup
Guide VMware vSphere 6.5 for VxRail 4.5.0+, or vSphere Installation and Setup Guide Update 2 VMware
vSphere 6.0 for VxRail 3.5 and VxRail 4.0.x.
The vCenter Server and the Platform Services Controller
are deployed on a single virtual machine or physical server.
The vCenter Server and the Platform Services Controller are
deployed as separate virtual machines or physical servers.
The Platform Services Controller can be shared across several
vCenter Server instances. You can install a Platform Services
Controller and then install several vCenter Server instances
and register them with the Platform Services Controller. You
can then install another Platform Services Controller,
configure it to replicate data with the first Platform Services
Controller, and then install vCenter Server instances and
register them with the second Platform Services Controller.

4 | vCenter Planning Guide
© 2019 Dell Inc. or its subsidiaries.
VxRail Appliances
VxRail was jointly developed by Dell EMC and VMware and is the only fully integrated, pre-configured, and
tested HCI appliance powered by VMware Virtual SAN (vSAN). Managed through the vCenter Server interface,
VxRail provides a familiar vSphere experience that enables streamlined deployment and the ability to extend
the use of existing IT tools and processes.
VxRail Appliances are managed using VxRail Manager software for hardware and appliance maintenance
tasks as well as software lifecycle management. VxRail Manager incorporates ESRS and other serviceability
capabilities. Additionally, VxRail Appliances are discoverable and visible in Dell EMC Vision™ Intelligent
Operations.
The VxRail software bundle is preloaded and licensed onto hardware and consists of the following
components (specific software versions not shown):
•VxRail Manager
•VMware vCenter Server
•VMware vRealize Log Insight™
1
•VMware vSAN™
•EMC Secure Remote Support (ESRS)/VE
Also preloaded is VMware vSphere®; however, licenses are required and can be purchased through Dell EMC,
VMware or your preferred VMware reseller partner.
The VxRail Clusters also include licenses for software that can be downloaded, installed and configured:
•Dell EMC Recover Point for Virtual Machines (RP4VM) - 15 Full Licenses per G-series appliance chassis
or 5 Full Licenses per all other single node VxRail series appliances
VxRail is fully compatible with other software in the VMware ecosystem, including VMware NSX. Refer to the
VMware Product Interoperability Matrices for specific versions of NSX supported on specific versions of
vSphere.
VxRail vCenter Server Options
The initial releases of VxRail deployed a vCenter Server Appliance on the VxRail Appliance. The license for
this vCenter Server Appliance was included with VxRail. This vCenter Server deployment has been referred to
as “internal” vCenter Server or “embedded” vCenter Server. For consistency, the term used throughout this
guide will be VxRail vCenter Server. VxRail orchestrates the deployment and lifecycle management of the
VxRail vCenter Server. This VxRail vCenter Server can only manage the VxRail Cluster on which it is deployed.
Beginning with release 3.5, a VxRail Appliance can optionally join a compatible vCenter Server environment,
hosted outside of the VxRail Cluster. This allows for a central vCenter Server instance to manage multiple
VxRail Clusters. Each VxRail environment appears within vCenter Server as a cluster of hosts configured with
a vSAN datastore. This has been referred to “external” vCenter Server or “existing” vCenter Server. For
consistency, the term used throughout this guide will be Customer Supplied vCenter Server. This instance of
vCenter Server must exist before you deploy the VxRail Appliance and requires a separate customer provided
license. The Customer is responsible for deployment, configuration and lifecycle management of the Customer
Supplied vCenter Server.
1
Log Insight is a configuration option only if VxRail vCenter Server is used.
For day-to-day VM management, customers manage the VMware stack on the VxRail Appliance
directly through vCenter Server.

5 | vCenter Planning Guide
© 2019 Dell Inc. or its subsidiaries.
A VxRail Cluster’s virtual infrastructure is managed by a single vCenter Server instance, either VxRail vCenter
Server or Customer Supplied vCenter Server. At this time, when a VxRail Appliance is deployed, the vCenter
deployment type is selected and is difficult to change. If a customer wants to make a change, for VxRail 3.5
and 4.0.1 it would require a factory reset and all data would need to be wiped from the VxRail appliance and
reinstallation would be required. Migrating a VxRail 4.0.2 vCenter Server to a Customer Supplied vCenter
requires an RPQ. Starting with VxRail 4.0.301 your Dell EMC service team can do this procedure.
VxRail vCenter Server
As part of a VxRail deployment, a vCenter Server instance with an external Platform Service Controller is
configured. The vCenter Server and the PSC are separate Linux-based virtual machines. Both the VxRail
vCenter Server and PSC are deployed on the VxRail Appliance cluster it is managing and cannot be moved off
the cluster after deployment.
The VxRail vCenter license is for the VxRail vCenter Server and is not transferable to be used for a Customer
Supplied vCenter Server. As such, it can be considered a limited or restricted use vCenter Server license as will
be seen by the use cases supported and the list of limitations below.
Use Cases
A VxRail vCenter Server is an ideal choice for:
•Small configurations
•Standalone environments
Limitations
•The VxRail vCenter Server will only manage its own VxRail Cluster.
▪It cannot manage other VxRail Clusters.
▪It cannot manage any other ESXi hosts.
▪It cannot be used as a Customer Supplied vCenter Server.
•Enhanced link mode is not supported.
•Single Sign-On domain cannot be customized and will be vsphere.local.
Prior to VxRail 4.5.200, VxRail vCenter Server does NOT support these:
•With Stretched clusters in case of an Inter-Switch Link (ISL) failure, all virtual machines that are not on
the same site as the vCenter will be powered off. Thus, special attention is needed when planning to
deploy an internal vCenter.
•Prior to VxRail 4.5.200, the VxRail vCenter Server does NOT support encryption.
Customer Supplied vCenter Server
The figure below shows an example where multiple VxRail clusters are part of a Customer Supplied vCenter
environment. Each cluster appears as a separate cluster within vCenter. In addition to centralized
management, being part of the same vCenter environment allows VMs to be easily migrated into and between
vSAN environments for optimal workload balance and simplifies VxRail Appliance upgrades and expansion.
The Customer Supplied vCenter Server provides more configuration options and is recommended.

6 | vCenter Planning Guide
© 2019 Dell Inc. or its subsidiaries.
Use Cases
A Customer Supplied vCenter Server solution is required when:
•Enhanced link mode is desired.
•VxRail is being added to an existing VMware platform and a single management instance is desired.
•Multiple VxRail Clusters will be deployed and a single management interface is desired.
Prior to VxRail 4.5.200, Customer Supplied vCenter Server solution is required when:
•Stretched clusters are part of the solution.
•vSAN encryption is desired. When enabling Data At Rest Encryption (DARE) in a vSAN cluster the Key
Management Server (KMS) must be external to the vSAN cluster.
Limitations
•VxRail Manager does not upgrade the Customer Supplied vCenter Server. Before an upgrade of VxRail
Appliance software, please refer to the release notes to verify the required vCenter Server release number.
It may be necessary to upgrade the Customer Supplied vCenter Server prior to the VxRail upgrade.
•The virtual machine name and IP address of the Customer Supplied vCenter Server and PSC cannot be
modified after VxRail deployment.
•Prior to VxRail 4.7, special approval is required if the Customer Supplied vCenter Server is hosted on a
VxRail Cluster.
▪The VxRail Cluster Shutdown function will require you to power off all VMs manually. We highly
recommend the vCenter be backed up to a remote site in case of vSAN failure.
Notes
•The Customer is responsible for the Customer Supplied vCenter Server license.
•Log Insight is not activated when using a Customer Supplied vCenter Server.
•Only one public IP address for the vCenter HA network is supported.
The Customer Supplied vCenter Server deployment can be a physical server or a virtual server running
on either a vCenter Server Appliance or in a Windows environment with embedded or external PSC.

7 | vCenter Planning Guide
© 2019 Dell Inc. or its subsidiaries.
VMware vSphere Recommended Topologies for vCenter Server
VMware provides a list of recommended topologies for VMware vCenter Server deployments. For vSphere
6.5, the vCenter Server topologies are described in VMware KB article 2147672. For vSphere 6.0 the vCenter
Server topologies are described in VMware KB article 2108548. The following table indicates for each
topology whether a VxRail vCenter Server or a Customer Supplied vCenter Server could support this topology.
Recommended Topology
VxRail vCenter
Server
Customer Supplied
vCenter Server
* requires a vCenter Server
license
Limitations:
Does not support Enhanced Linked Mode
Does not support PSC replication
No.
If a customer wants
an embedded PSC,
they cannot use the
VxRail vCenter
Server.
Yes.
A customer would be
required to have a Customer
Supplied vCenter Server with
an embedded PSC deployed
to achieve this topology.
Yes.
Note: there is only
one vCenter Server
Yes.
1 Single Sign-On domain
1 Single Sign-On site
More than 1 vCenter Server(s) with PSC on a different machine
No.
Yes.
1 Single Sign-On domain
1 Single Sign-On Site
1 vCenter Server with embedded PSC
1 Single Sign-On domain
1 Single Sign-On site
1 vCenter Server with PSC on a different
machine

8 | vCenter Planning Guide
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1 Single Sign-On domain
2 or more Single Sign-On sites
2 or more vCenter Server with external PSCs
No.
Yes.
1 Single Sign-On domain
1 Single Sign-On site
2 or more external PSC(s)
1 or more vCenter Server with external PSCs using 1 third-party load
balancer
No.
Yes.
1 Single Sign-On domain
2 Single Sign-On sites
2 or more external PSCs per Single Sign-On Site
1 or more vCenter Server with external PSC(s)
2 third-party load balancers (1 per site)
No.
Yes.

9 | vCenter Planning Guide
© 2019 Dell Inc. or its subsidiaries.
1 Single Sign-On domain
2 Single Sign-On sites
2 or more external PSCs per Single Sign-On site
1 or more vCenter Server with external PSC(s)
No.
Yes.
1 Single Sign-On domain
1 Single Sign-On site
vCenter Server with PSC on same vCenter Server Appliance
3 vCenter Server Appliances are used (1 Active, 1 Passive, and 1 Witness
connected to the vCenter HA network).
Limitations:
Does not support Enhanced Linked Mode
Does not support PSC replication
No.
Only vCenter Server 6.5,
which requires VxRail 4.5.x.
NOTE: Only one public IP
address for the vCenter HA
Network is supported.
1 Single Sign-On domain
1 Single Sign-On site
2 or more external PSCs
vCenter Server connected to PSC using 1 third-party load balancer
3 vCenter Server Appliances are used (1 Active, 1 Passive, and 1 Witness
connected to the vCenter HA network).
No.
Only vCenter Server 6.5,
which requires VxRail 4.5.x
NOTE: Only one public IP
address for the vCenter HA
Network is supported.

10 | vCenter Planning Guide
© 2019 Dell Inc. or its subsidiaries.
VxRail vCenter Server Deployment Details
The following provides the high-level details of each deployment option. It is important to understand the
pre-requisites before deployment. This document covers the requirements related to vCenter Server only. See
the Dell EMC VxRail Network Guide for complete VxRail implementation requirements.
VxRail vCenter Server
Please note that the vCenter license included with the VxRail Appliance is for use of the VxRail vCenter Server
only and is not transferable for use as a Customer Supplied vCenter Server.
Requirements
This scenario requires:
•A reserved vCenter Server hostname
•A reserved IP address for the VxRail vCenter Server
•A reserved PSC hostname
•A reserved IP address for the new VxRail vCenter Server Platform Service Controller
•DNS names to be configured correctly.
Customer Supplied vCenter Server
When deploying a VxRail Appliance into an existing VMware virtualization infrastructure, it makes sense to
use the Customer Supplied vCenter Server that is managing the current environment to also manage the VxRail
Appliance. This allows a remote central vCenter Server to manage multiple VxRail clusters in a single
management instance.
The Customer Supplied vCenter Server can be:
•Standalone with an embedded PSC or external PSC
•A vCenter Server Appliance virtual machine or vCenter Server for Windows
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•Using Enhanced Linked Mode
Requirements
•Prior to VxRail 4.5.200, the Customer Supplied vCenter can NOT be hosted on the VxRail Cluster it is
managing.
•Starting with VxRail 4.5.200, the Customer Supplied vCenter Server can be hosted on the VxRail Cluster it is
managing.
•The Customer Supplied vCenter Server version must be identical to the VxRail vCenter Server version. Check
the VxRail Release Notes for to determine the proper version numbers. In addition, the ESXi version of the
cluster hosting the Customer Supplied vCenter should be identical to the ESXi host version of the VxRail
Cluster.
2
Starting after vCenter Server 6.5, VMware plans to deprecate vCenter Server for Windows with the next numbered release (not update release) of
vSphere.

11 | vCenter Planning Guide
© 2019 Dell Inc. or its subsidiaries.
▪VxRail 3.5 and vSphere 6.0, version details can be found in VxRail Appliance Software 3.5 Release
Notes.
▪VxRail 4.0.x and vSphere 6.0, version details can be found in VxRail Appliance Software 4.0.x Release
Notes.
▪VxRail 4.5.x and vSphere 6.5, version details can be found in VxRail Appliance Software 4.5.x Release
Notes.
▪VxRail 4.7.x and vSphere 6.7, version details can be found in VxRail Appliance Software 4.7.x Release
Notes.
•Customer provides the vCenter Server license.
If you want VxRail to join a Customer Supplied vCenter Server, you will need to:
•Know the Customer Supplied vCenter Server FQDN.
•Know whether your Customer Supplied vCenter Server has an embedded or non-embedded Platform
Services Controller. If the PSC is non-embedded, you will need the PSC FQDN.
•Know the Customer Existing Single Sign-On domain (SSO) (for example, vsphere.local)
•Create a VxRail management user and password for this VxRail cluster on the Customer Supplied vCenter
Server. This user must be:
▪Created with no permissions
▪Created with no roles assigned to it
Note that if a previous VxRail Cluster has been deployed on the Customer Supplied vCenter Server, the VxRail
Management User can be re-used if the customer so chooses.
•Create or select a datacenter on the Customer Supplied vCenter Server for the VxRail Cluster to join.
•Specify the name of the cluster that will be created by VxRail in the selected datacenter when the cluster is
built. This will also be the name of the distributed switch. This name must be unique and not used
anywhere in the datacenter on the Customer Supplied vCenter Server.
•Verify the customer DNS server can resolve all VxRail ESXi hostnames before deployment.
•(Optional) Create a VxRail non-admin user and password for VxRail on the Customer Supplied vCenter
Server. The following will be done by your Dell EMC Representative:
▪Create two new roles, VxRail Initial Global and VxRail Datacenter Global.
▪Assign each of these roles to the new VxRail admin user.
Starting with VxRail 4.5.200, it is possible to deploy a Customer Supplied vCenter Server on an
existing VxRail Cluster, even the one it is managing, provided that stretched clusters are not part
of the deployment. Note that this still requires the customer provide a vCenter Server license.
Please note this still requires a customer provide a vCenter Server license

12 | vCenter Planning Guide
© 2019 Dell Inc. or its subsidiaries.
Conclusion
During the planning stage of a VxRail Cluster configuration, careful planning should take place to determine
the best vCenter Server deployment topology for your environment. VxRail gives you the option of using a
Customer Supplied vCenter Server so that more topologies can be supported. The VxRail vCenter Server has
very limited use case application. Since the decision for the topology is not changeable after deployment for
any use case, careful planning is essential.
For further details on the best vCenter deployment options contact your Dell EMC sales team or your VMware
representative.
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