These configurations are carefully designed to provide fail-proof architecture to run the critical applications in your business — those that demand the highest availability. Possible high availability server configurations might include multiple hosts managed by redundant load balancers and replication hosts.
As well as redundant firewalls for added security and reliability. Nowadays businesses rely on the Internet. And not just financial losses. Loss of reputation can be equally devastating.
According to StrategicCompanies more than half of Fortune companies experience a minimum of 1. That amounts to huge losses of time, profit, and consumer confidence. Consider: In the year , 30 minutes of an outage to Amazon. Take a moment to drink that in. That might sound good, in theory. If the downtime hits during peak periods, the loss to your business can be disastrous. The best way to prevent downtime and eliminate these losses is to opt for high availability hosting solutions.
Built on a complex architecture of hardware and software, all parts of this system work completely independently of each other. It can handle very large volume of requests or a sudden surge in traffic. It grows and shrinks with the size and needs of your organization.
Following are some of the best high availability solutions you can use to host your business applications. High performance servers are high-end dedicated solutions with larger computing capacity, especially designed to achieve the maximum performance.
They are an ideal solution to cater enterprise workloads. One of our existing customers was looking for a high-end game server to host flash games with encoded PHP and MySQL server as a backend. To achieve the highest availability, they demanded 2 load balancers with failover.
Each of them contains 2 web servers and a database server. Our capacity planning team designed a fully redundant infrastructure with dual load balancers sitting in front of web and database servers. This setup consists of 2 VMs with load balancers connected to a group of web servers through a firewall. For a failover, we set up an exact replica of this architecture with real-time mirroring.
Should the primary system fail, the secondary setup will seamlessly take over the workload. Zero downtime. The process of distributing incoming web traffic across a group of servers efficiently and without intervention is called Load Balancing.
A hardware or software appliance which provides this load balancing functionality is known as a Load Balancer. A load balancer sits in front of your servers and routes the visitor requests across the servers. It ensures even distribution, i. When your customers visit your website, they are first connected to load balancer and the load balancer routes them to one of the web servers in your infrastructure.
If any server goes down, the load balancer instantly redirects the traffic to the remaining online servers. As web traffic increases, you can add new servers quickly and easily to the existing pool of load-balanced servers. When a new server is added, the load balancer will start sending requests to new server automatically.
The DNS service balances the web traffic across the multiple servers. Note that when you perform the traffic load balancing through this method you cannot choose which load balancing algorithm. It always uses the Round Robin algorithm to balance the load. This is the most expensive way of load balancing. It uses a dedicated hardware device that handles traffic load balancing.
Most of the hardware based load balancer systems run embedded Linux distribution with a load balancing management tool that allows ease of access and a configuration overview. Software-based load balancing is one of the most reliable methods for distributing the load across servers. In this method, the software balances the incoming requests through a variety of algorithms.
There are a number of algorithms that can be used to achieve load balance on the inbound requests. The choice of load balancing method depends on the service type, load balancing type, network status and your own business requirements. Typically, for low load systems, simple load balancing methods i. Check out this link for more information on some industry standard Load Balancing Algorithms used by the load balancers. HAProxy High Availability Proxy is the best available tool to set up a load balancer on Linux machines web server, database server, etc.
It is also used as a fast and lightweight proxy server software with a small memory footprint and low CPU usage. A scalable private cloud is a cloud-based system that gives you self-service, scalability, and elasticity through a proprietary architecture.
Private clouds are highly scalable that means whenever you need more resources, you can upgrade them, be it memory, storage space, CPU or bandwidth. It gives the best level of security and control making it an ideal solution for a larger business.
It enables you to customise computer, storage and networking components to best suit custom requirements. All your data is stored and managed on dedicated servers with dedicated access. You can run antivirus software on a SQL Server cluster. However, you must make sure that the antivirus software is cluster-aware.
Contact your antivirus software vendor about cluster-aware versions and interoperability. Additionally, you should exclude the following file system locations from virus scanning on a server that is running Cluster Services:.
For more information about running antivirus software on servers that are running SQL Server, see How to choose antivirus software to run on computers that are running SQL Server. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Please rate your experience Yes No. Any additional feedback? Network settings and IP addresses: When you use identical network adapters for a network, also use identical communication settings on those adapters for example, Speed, Duplex Mode, Flow Control, and Media Type.
Also, compare the settings between the network adapter and the switch it connects to and make sure that no settings are in conflict. If you have private networks that are not routed to the rest of your network infrastructure, ensure that each of these private networks uses a unique subnet. This is necessary even if you give each network adapter a unique IP address.
For example, if you have a cluster node in a central office that uses one physical network, and another node in a branch office that uses a separate physical network, do not specify For more information about the network adapters, see Hardware requirements for a two-node failover cluster, earlier in this guide. The DNS dynamic update protocol can be used.
Domain role: All servers in the cluster must be in the same Active Directory domain. As a best practice, all clustered servers should have the same domain role either member server or domain controller. The recommended role is member server. Domain controller: We recommend that your clustered servers be member servers. If they are, you need an additional server that acts as the domain controller in the domain that contains your failover cluster.
Clients: As needed for testing, you can connect one or more networked clients to the failover cluster that you create, and observe the effect on a client when you move or fail over the clustered file server from one cluster node to the other. Account for administering the cluster: When you first create a cluster or add servers to it, you must be logged on to the domain with an account that has administrator rights and permissions on all servers in that cluster. The account does not need to be a Domain Admins account, but can be a Domain Users account that is in the Administrators group on each clustered server.
In addition, if the account is not a Domain Admins account, the account or the group that the account is a member of must be given the Create Computer Objects and Read All Properties permissions in the domain organizational unit OU that is will reside in. If you have already installed the cluster nodes and want to configure a file server failover cluster, see Steps for configuring a two-node file server cluster, later in this guide. For a failover cluster network, avoid having single points of failure.
Alternatively, you can connect your cluster nodes with one network that is constructed with teamed network adapters, redundant switches, redundant routers, or similar hardware that removes single points of failure If you use a network for iSCSI, you must create this network in addition to the other networks. For a two-node file server cluster, when you connect the servers to the cluster storage, you must expose at least two volumes LUNs. You can expose additional volumes as needed for thorough testing of your configuration.
Do not expose the clustered volumes to servers that are not in the cluster. Review the details about networks in Hardware requirements for a two-node failover cluster and Network infrastructure and domain account requirements for a two-node failover cluster, earlier in this guide. If your test configuration includes clients or a non-clustered domain controller, make sure that these computers can connect to the clustered servers through at least one network.
Ensure that the disks LUNs that you want to use in the cluster are exposed to the servers that you will cluster and only those servers. You can use any of the following interfaces to expose disks or LUNs:. If you have purchased software that controls the format or function of the disk, follow instructions from the vendor about how to use that software with Windows Server.
On one of the servers that you want to cluster, click Start, click Administrative Tools, click Computer Management, and then click Disk Management.
If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.
In Disk Management, confirm that the cluster disks are visible. If you want to have a storage volume larger than 2 terabytes, and you are using the Windows interface to control the format of the disk, convert that disk to the partition style called GUID partition table GPT. To do this, back up any data on the disk, delete all volumes on the disk and then, in Disk Management, right-click the disk not a partition and click Convert to GPT Disk.
For volumes smaller than 2 terabytes, instead of using GPT, you can use the partition style called master boot record MBR. Check the format of any exposed volume or LUN. In this step, the file server role and failover cluster feature will be installed. Both servers must be running either Windows Server or Windows Server For the Installation Type , select Role-based or feature-based installation and Next. Ensure Select a server from the server pool is selected, the name of the machine is highlighted, and Next.
For the Features, from the list of features, select Failover Clustering. A popup dialog will show that lists the administration tools also being installed.
Keep all the selected, choose Add Features and Next. Before creating a cluster, we strongly recommend that you validate your configuration. Validation helps you confirm that the configuration of your servers, network, and storage meets a set of specific requirements for failover clusters. In the Select Servers or a Cluster window, add in the names of the two machines that will be the nodes of the cluster. You can also choose the Browse button to search Active Directory for the names.
Once both are listed under Selected Servers , choose Next. In the Testing Options window, select Run all tests recommended , and Next. On the Confirmation page, it will give you the listing of all the tests it will check.
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