SAN/NAS Storage

A storage area network (SAN) is a dedicated network that provides access to consolidated, block level data storage.

SANs are primarily used to make storage devices, such as disk arrays, tape libraries, and optical jukeboxes, accessible to servers so that the devices appear like locally attached devices to the operating system. A SAN typically has its own network of storage devices that are generally not accessible through the local area network by other devices. The cost and complexity of SANs dropped in the early 2000s to levels allowing wider adoption across both enterprise and small to medium sized business environments.



SAN solutions should increase data storage performance, availability, and efficiency for mission-critical applications.  For your high-performance applications, you need to maximize data utilization, optimize storage performance and availability, and eliminate duplicate data.


With NetApp® SAN solutions, you can maintain high performance and availability while also achieving greater storage efficiency.  In addition, our SAN solutions support the NetApp clustered Data ONTAP® operating system for nondisruptive operations, proven efficiency, and seamless scalability.  These benefits persist even with server virtualization, in which higher I/O rates, greater capacity, and faster provisioning put heavy demands on storage systems. 



Network-attached storage (NAS)SAN NAS NETAPP

Network attached storage is file-level computer data storage connected to a computer network providing data access to a heterogeneous group of clients.


NAS not only operates as a file server, but is specialized for this task either by its hardware, software, or configuration of those elements. NAS is often manufactured as a computer appliance – a specialized computer built from the ground up for storing and serving files – rather than simply a general purpose computer being used for the role

NetApp NAS solutions support clustered Data ONTAP scale-out capabilities for reliable scaling without reconfiguration. Exponential data growth complicates your choice of data storage systems. NetApp® network-attached storage (NAS) solutions simplify data management, boost reliability and storage efficiency, and help you keep pace with growth. Whether your business uses NFS or CIFS protocols, NAS devices support both.



Sharing storage usually simplifies storage administration and adds flexibility since cables and storage devices do not have to be physically moved to shift storage from one server to another.  Other benefits include the ability to allow servers to boot from the actual SAN itself. This allows for a quick and easy replacement of faulty servers since the SAN can be reconfigured so that a replacement server can use the LUN of the faulty server. While this area of technology is still new, many view it as being the future of the enterprise datacentre.

SANs also tend to enable more effective disaster recovery processes. A SAN could span a distant location containing a secondary storage array. This enables storage replication either implemented by disk array controllers, by server software, or by specialized SAN devices.  Since IP WANs are often the least costly method of long-distance transport, the Fibre Channel over IP (FCIP) and iSCSI protocols have been developed to allow SAN extension over IP networks. The traditional physical SCSI layer could only support a few meters of distance - not nearly enough to ensure business continuance in a disaster.  The economic consolidation of disk arrays has accelerated the advancement of several features including I/O caching, snapshotting, and volume cloning.