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Windows server 2012 standard failover cluster free
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Creating Failover Clusters in Windows Server Hyper-V | Petri IT Knowledgebase – System services ports
This article describes the Microsoft support policy for Windows Server or Windows Server R2 failover clusters. Step 1: Configure roles / features on nodes for high availability. Install MS Windows Server or MS Server onto your two server nodes. In the Server.
Setting up Hyper-V Failover Cluster in Windows Server R2 – Resolution
Customers running an FCI continued to maintain their existing infrastructure and upgraded to later versions as appropriate. However, those running Database Mirroring were faced with the challenge of upgrading especially when the principal and the mirror SQL Server instances are running Standard Edition. The dilemma: either postpone the upgrade and run the risk of being in an unsupported configuration or make the leap and upgrade to Enterprise Edition.
These changes in licensing and new features made it very clear that Microsoft really does want customers to move towards Enterprise Edition. But unlike its Enterprise Edition counterpart, there are some limitations.
You cannot enable the secondary replica as a readable secondary. This is the same as Database Mirroring in Standard Edition. If you want to enable the secondary replica or mirror partner in Database Mirroring for reporting workloads, you need Enterprise Edition. No is the only option when you click on the drop-down list under the Readable Secondary column in the Specify Replicas page of the New Availability Group Wizard.
While there are limitations, there are also advantages when you compare them with Database Mirroring in Standard Edition. Understanding the benefits and limitations of Basic Availability Groups can give you enough information to decide whether you would like to still use Database Mirroring regardless of its deprecation status or upgrade to Enterprise Edition to take advantage of all the Availability Group features.
However, both options still put you at a disadvantage — the former being at the risk of using an unmaintained feature, the latter being more expensive. This feature is not new and has been around since SQL Server 6.
Highlighted below are the differences between the two that can help you make the right decision in choosing the appropriate high availability solution. While the comparisons apply to traditional Availability Groups as well, the focus will be on Basic Availability Groups. A database is an object that resides within an instance. Understanding the difference between an instance and a database can help make decisions in implementing the appropriate high availability solution in terms of operational efficiency.
In an FCI, the entire instance is protected. If the primary node becomes unavailable, the entire instance is moved to the standby node. These instance-level objects are stored in the system databases which are physically stored in shared storage. In an Availability Group — be it the traditional or basic — only the databases in the group are protected. System databases cannot be added to an Availability Group — only user databases are allowed.
If all the dependent system objects are not replicated on all replicas, the database may end up becoming inaccessible to the application; as in the case of missing SQL Server logins or partially functional as in the case of missing certificates for Always Encrypted SQL Server Service Pack 1 made Always Encrypted available in Standard Edition. If you are more concerned with instance-level protection to minimize possible human error during change management processes, then, an FCI is the way to go.
An FCI requires some form of shared storage. The shared storage is accessible to all of the nodes in the failover cluster but only the current primary node has ownership at any given point in time. The system and user databases are stored on the shared storage. When a failover occurs, ownership of the shared storage moves from the current primary to the standby, making the databases available to the new primary node. From a capacity point-of-view, you only need to provision disk space based on the sizes of the databases.
However, from an availability point-of-view, the shared storage becomes a single point of failure. The FCI will remain offline if the shared storage becomes unavailable, regardless of the number of nodes in the failover cluster. An Availability Group does not require shared storage. Each replica has its own local storage independent of the Availability Group.
If the primary replica becomes unavailable and a failover occurs, any secondary replica can take over without having to rely on the availability of the system and user databases from the primary replica. From a capacity point-of-view, you need to provision disk space based on the sizes of the databases and the number of secondary replicas, significantly increasing the cost per gigabyte. But from an availability point-of-view, because the Availability Group replicas do not rely on a single storage source, the SQL Server instance hosting the replicas remains online regardless of what happens to the primary replica.
Each Availability Group replica has its own copy of the system databases, thus, it is always online regardless of whether it is functioning as a primary or a secondary replica. The complexities of a shared storage subsystem like a storage area network SAN require the proper administration to guarantee high availability and resiliency because the storage becomes a single point of failure.
You may have certain disaster recovery requirements to have multiple copies of your databases. Because of the shared storage requirement, an FCI will only have a single copy of the databases. If you need multiple copies of your databases, you will need to implement either log shipping, database mirroring or Availability Group together with the FCI.
This requires additional cost in terms of licensing and administrative overhead. Not so with Availability Groups. The standby server is only covered by a license if it comes with Software Assurance. Assume that you will only run a single instance FCI in a 2-node failover cluster and two replicas in a Basic Availability Group.
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Microsoft Windows. Components History Timeline Criticism. Windows 1. Windows 95 Windows 98 Windows Me. Embedded Compact CE 5. Phone 7 Phone 8 Phone 8. Cairo Nashville Neptune Odyssey. List of versions Comparison Category. Authority control: National libraries France data Germany. Categories : Windows Server X operating systems software. Namespaces Article Talk.
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Windows Server R2
