In Windows Server 2012 (and R2), Microsoft released the Scale Out File Server (SOFS) feature. SOFS provides highly available file-based storage for applications and general use, and they are particularly well suited for Hyper-V storage.
Scale-out file shares allow the same folder or file to be shared from multiple cluster nodes. If you setup your Hyper-V environment to leverage SOFS and SMB 3.0, your VMs can be accessed simply with a UNC pathname. For example:
SMB 3.0 manages all the load balancing, redundancy and network management for fault tolerance. Also with SOFS clusters, all nodes are active-active, so provisioning additional servers increases performance for your scale-out file shares and services and insures that all compute resources are leveraged in your configuration.
Microsoft touts these key benefits of SOFS:
- Active-Active file shares – All cluster nodes can accept and serve SMB client requests. This provides transparent failover to alternative cluster nodes.
- Increased bandwidth – The maximum share bandwidth is the total bandwidth of all file server cluster nodes.
- CHKDSK with zero downtime
- Clustered Shared Volume cache – a significant performance boost.
- Simpler management With Scale-Out File Server, you create the scale-out file servers, and then add the necessary CSVs and file shares. Much simpler than prior cluster management.
- Automatic rebalancing of Scale-Out File Server clients
You can read more details on SOFS on Microsoft’s Technet site.
By leveraging SOFS for your Hyper-V storage, you get a simple storage management interface for your Hyper-V administration (similar to NAS storage) while enjoying performance and availability of typically expensive and complex SANs. In a future post, we will take a look at setting up and managing SOFS.