Re: How VMware And Microsoft Server Load-balancing Services work
Varyarmah Knox
In large environments, for scalability and operational efficiency, it is normally best practice to have a separate vSphere cluster to host the management components. This keeps the VMs that run services such as Connection Server, Unified Access Gateway, vCenter Server, and databases separate from the desktop and RDSH server VMs.
When deployed for Horizon Edge services a standard size Unified Access Gateway appliance is sized for up to 2,000 sessions. When designing Unified Access Gateway appliance numbers, a balance with the number of Connection Servers should be considered to ensure that overall availability is maintained in the event of either server component.
External connections include the use of VMware Unified Access Gateway to provide secure edge services. The Horizon Client authenticates to a Connection Server through the Unified Access Gateway. The Horizon Client then forms a protocol session connection, through the secure gateway service on the Unified Access Gateway, to a Horizon Agent running in a virtual desktop or RDSH server.
To support service-level fault tolerance you can create a two-node Horizon Cloud Connector cluster by adding a worker node to the cluster containing the primary node. The worker node contains a replica of the Horizon Cloud Connector application services. For more information on Horizon Cloud Connector Clusters and to understand which services can currently be protected, see Horizon Cloud Connector 2.0 and Later - Horizon Cloud Connector Clusters, Node-Level High Availability, and Service-Level Fault Tolerance.
Horizon Control Plane services are not yet able to differentiate that capacity is deployed across multiple sites. As a result, Image Management Service functionality will not work when used on a vCenter Server that is remote to the Connection Servers.
The Composer service works with the Connection Servers and a vCenter Server. Each Composer server is paired with a vCenter Server in a one-to-one relationship. For example, in a block architecture where we have one vCenter Server per 4,000 linked-clone VMs, we would also have one Composer server.
I am trying to use nlb to connect two vm's that serve as sharepoint 2007 front end web servers. The two vm's reside on different ESX hosts. I have created two vNIC's in each vm, one with an IP address and gateway, one with IP address and no gateway but on the same vlan. I've tried unicast and multicast, and what seems to happen is that once the nlb hosts converge, they lose connectivity to eachother thus breaking the bond. I've tried using both vNIC's as the cluster addresses for the hosts, but it happens to fail either way. Has anyone succeeded at this? I've got a dev environment where the two vm's are on the same vSwitch and it works ok, but that won't fly for prod. Thanks for any advice.
I think we are talking about two different things. I am try to set up Microsoft Network Load Balancing on two front end web servers. If one goes down, clients will be redirected to the other. I'm not worried about sharing the load between two nics on the same server. One of the best practices for NLB is to have two NICS, one for the cluster, the other for background traffic. It doesn't matter which of the two nics on each server I bond to the NLB Cluster, i can only access the website in the same subnet that the cluster exists. For instance, my server lives in vlan 128 and my computer (client) lives in vlan 40. Doesn't work. However, another server in 128 can access the cluster without problems.
Over the past few years, it has been made clear that hospitals are critical ecosystems that support their local communities. Unfortunately, during this time it has also made them targets for ransomware and strained their already burdened IT staff. The ability to seamlessly migrate life-critical workloads to the cloud has become paramount. With operational risks such as ransomware and limited IT staff, cloud is not only appealing but is becoming a necessity for hospital IT environments. While some stakeholders may have doubts about the cloud and its capabilities, the reality is that many government entities provide their communities with cloud-based services that are deemed as life-critical. With that in mind, cloud adoption can be tiered in a systematic approach, by leveraging the existing application model and migrating secondary or tertiary workloads. Migrating healthcare workloads to Azure VMware Solution can address these issues.
Azure VMware Solution delivers VMware-based private clouds in Azure. The private cloud hardware and software deployments are fully integrated and automated in Azure. The cloud is deployed and managed through the Azure portal, CLI, or PowerShell. The diagram below illustrates a private cloud within its own Azure Resource Group, with adjacent connectivity to various native Azure services located in another resource group. The private cloud is hosted on VMware vSphere clusters with vSAN storage, managed by VMware vCenter, utilizing NSX-T for network connectivity. NSX-T network traffic is routed to an AVS Top of Rack switch then to Microsoft Edges and out to other Azure services, the internet, or even on-premises.
You should be familiar with the vendor and have established support relationships. Choose a load balancer that is large enough to handle the network's peak throughput needs. To properly size load balancers for Azure deployments, work with Microsoft and your load-balancing vendor. A centralized load balancing control plane will be key to efficient management of the load balancing infrastructure and appliances.
This section focuses on strategies and guidance when implementing shared infrastructure services in Azure VMware solution. The shared services are required for Epic and supplemental services within the environment. VMware HCX and NSX-T provide network extensibility in a lift-and-shift scenario. We will be focusing on extending and adding services to create a hybrid environment.
With our growing user base, our software provider recommends deploying a cluster for performance gains. I am assuming at this point that it would be a more load-balancing thing so one server doesn't get overloaded after, say 50 users connect.
If you decide to go this way, I would recommend implementing high availability and fault-tolerance in addition to load-balancing features for your cluster. You can do it by using virtual SAN software -virtual-san Opens a new window that will mirror the storage between your servers for clustering. You can keep the RDS hosts bound to each of the physical servers, but the session broker must be alive if one of the servers fails or needs maintenance.
VMware vSAN (vSAN) is the VMware software-defined storage solution for hyperconverged infrastructure (HCI), a software-driven architecture that delivers tightly integrated computing, networking, and highly resilient shared storage from x86 servers. Like vSphere, vSAN provides users the flexibility, and control to choose from a wide range of hardware options; and easily deploy and manage them for a variety of IT workloads and use cases.
Distributed resource-scheduling provides active load-balancing of VM workloads within a vSphere cluster. Aside from the active monitoring and load-balancing functions, DRS provides the following features:
DRS takes vSphere vMotion a step further by adding an intelligent scheduler. DRS allows you to set resource assignment policies that reflect business needs. DRS does the calculations and automatically handles the details of physical resource assignments. It dynamically monitors the workload of the running VMs and the resource utilization of the physical servers within a vSphere cluster.
Although virtualization has allowed organizations to optimize their compute and storage investments, the network has mostly remained physical. VMware NSX for vSphere solves datacenter challenges found in physical network environments by delivering software-defined networking and security. Using existing vSphere compute resources, network services can be delivered quickly to respond to business challenges. VMware NSX is the network virtualization platform for the SDDC. By bringing the operational model of a VM to a data center network, the economics of network and security operations can be transformed. NSX enables treatment of a physical network as a pool of transport capacity, with network and security services attached to VMs with a policy-driven approach.
Although the Client Access Servers (CAS) role has been coupled with the Mailbox Server role in Exchange Server 2019, client access to the Exchange infrastructure still requires efficient load-balancing to provide a highly available and well-performing experience for end users. To provide this functionality, hardware load-balancers are deployed in front of the Mailbox servers. If the load-balancer solution must be highly available, this can double the hardware investment required. In multisite deployments, this can mean up to four hardware load-balancers are required to provide a highly available load-balancing solution.
The advantage of the one-arm load-balancer model is that it is simpler to deploy and is flexible. It allows deployment of load-balancer services (i.e., VMware NSX Edge appliances) directly on the logical segments where they are needed without requiring any modification on the centralized VMware NSX Edge that provides routing communication to the physical network. On the downside, this option requires provisioning of more VMware NSX Edge instances and mandates the deployment of source network address translation (NAT) that does not allow the servers in the data center to have visibility into the original client IP address.
The inline load-balancer model is also simple and allows the servers to have full visibility into the original client IP address. It is less flexible from a design perspective, as it usually forces using the load-balancer as a default gateway for the logical segments where the server farms are deployed, which implies that only centralized (and not distributed) routing must be adopted for those segments. The load-balancer is another logical service added to NSX Edge that is already providing routing services between the logical and the physical networks. Therefore, VMware recommends increasing the form factor of NSX Edge to X-Large before enabling load-balancing services.
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