SQL Server 2014: AlwaysOn

AlwaysOn was introduced in SQL Server 2012, and there are some enhancements in SQL Server 2014:

  • Now support up to 8 secondary replicas that remain available for reads at all times, even in the presence of network failures.  Failover Cluster Instances now support Windows Cluster Shared Volumes, improving the utilization of shared storage and increasing failover resiliency.  Finally, various supportability enhancements make AlwaysOn easier to use
  • More secondaries for AlwaysOn Availability Groups: Increased from 4 secondaries to 8
  • Improved reliability for AlwaysOn Availability Group secondaries: The secondaries will now stay online if the primary goes offline
  • Can use Azure VMs as AlwaysOn Availability Group replicas:  When adding a replica you can specify an Azure VM

More info:

AlwaysOn in SQL Server 2014 CTP1

(Almost) Everything You Need to Know About the Next Version of SQL Server

Changes to SQL Server 2014 Always On Availability Groups

About James Serra

James is a big data and data warehousing solution architect at Microsoft. Previously he was an independent consultant working as a Data Warehouse/Business Intelligence architect and developer. He is a prior SQL Server MVP with over 25 years of IT experience.
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One Response to SQL Server 2014: AlwaysOn

  1. Alex Aguilar says:

    Would you consider using AlwaysOn for databases used by a datamart?
    my first reaction was to say no because it would require FULL recovery model and we know that this recovery model is a performance killer for ETL loads. We rather not use shared disks and this is why the automatic response of “use fail over cluster with shared disks” is not our ideal answer if we can avoid it.