Cos'è una Storage Area Network o SAN? 

A storage area network (SAN) is a specialized, high-speed network that connects servers to storage devices, typically used by enterprises for business-critical applications that require high throughput and low latency.

SANs centralize block storage, allowing organizations to store data in a shared pool, enabling consistent data protection, security and disaster recovery practices.

How is data stored in a SAN?

In a SAN storage area network, data is stored in logical units known as LUNs (Logical Unit Numbers), which are blocks of storage provisioned from a shared storage pool. Servers view these LUNs as local disk storage, partition and format them, and use them to store data—just like with local storage. SANs are designed to offer high availability and resilience, easily withstanding multiple component or device failures.

SAN use cases

Storage area networks (SANs) are ideal for supporting performance-sensitive, business-critical applications. Common SAN use cases include:

• Oracle Databases: Critical for many businesses, these databases need the highest availability and performance, which SAN storage provides.
• Microsoft SQL Server Databases: Like Oracle databases, SQL databases require high-performance storage for mission-critical data.
• Virtualization Deployments: Large deployments using VMware, KVM, or Microsoft Hyper-V require reliable storage. SAN supports thousands of virtual machines with varying performance needs.
• Virtual Desktop Infrastructures (VDI): For environments serving large numbers of virtual desktops, SAN networking offers centralized data management for enhanced protection and security.
• SAP or ERP Systems: SAN architectures are ideal for large enterprise resource planning (ERP) and customer relationship management (CRM) systems due to their reliability and performance.

SAN vs. NAS: Key Differences

There are distinct differences found when comparing SAN vs. NAS, both provide centralized network storage but differ in how they manage data and the protocols they use. A SAN is block-level storage typically used for performance-critical applications, while NAS (Network Attached Storage) is file-based and focuses on ease of use, scalability, and lower cost. NAS vs SAN storage is often contrasted based on performance and complexity:

• SAN storage is Ethernet or Fibre Channel-based, focusing on low latency and high performance, typically used for databases and virtualization.
• NAS storage controllers own the file system and present it to the server, making it appear like a Windows or UNIX/Linux server.
• While SAN solutions are preferred for high-performance needs, NAS is often chosen for file sharing and easier management.

Types of SAN protocols

There are several protocols used in storage area networks to connect servers and storage devices:

• Fibre channel protocol (FCP): The most widely used SAN protocol, FCP utilizes Fibre Channel for high-speed communication and is the preferred choice for performance-sensitive environments.
• iSCSI (internet small computer system interface): Another popular SAN protocol, iSCSI encapsulates SCSI commands into IP packets, leveraging Ethernet for transport. It's a more cost-effective option.
• Fibre channel over ethernet (FCoE): Similar to iSCSI, FCoE encapsulates Fibre Channel frames into Ethernet packets, providing flexibility to use existing IP networks for SAN traffic.
• Non-volatile memory express over fibre channel (FC-NVMe): This newer protocol provides faster access to flash storage, supporting parallel commands for enhanced performance.

SAN vs NAS: Choose the right storage

Both SAN and NAS offer centralized storage solutions, but their use cases and performance needs differ:

• SAN is ideal for businesses requiring high performance and low latency, such as databases and large virtualization deployments.
• NAS is suitable for environments where scalability and ease of use are prioritized, such as file sharing and general data storage.

When choosing between SAN vs NAS storage, consider factors such as performance, scalability, ease of management, and total cost of ownership (TCO).

SAN architecture and technology

The backbone of any storage area network (SAN) is its architecture. A SAN architecture typically consists of:

• SAN servers: These provide the computing power needed to manage data requests.
• SAN storage devices: These devices house the actual storage units (disks, SSDs) and provide the data stored in LUNs to connected servers.
• SAN networking: High-speed connections between servers and storage devices ensure low latency and fast data access.

A well-designed SAN network is critical for ensuring data availability and maintaining performance, even during component failures.

SAN storage pricing and options

When considering SAN storage, it’s important to evaluate the storage area network price, as costs can vary based on performance, capacity, and scalability requirements. While high-performance solutions like all-flash SANs offer greater speed and lower latency, they come at a higher cost. However, for businesses needing reliable performance, SAN based storage is a cost-effective solution compared to local storage for critical workloads.

For those with budget constraints, cheap SAN storage options are available with configurations like hybrid storage systems, which combine flash and traditional spinning disks for a balanced approach to cost and performance.

FAQ and summary

NetApp SAN solutions

NetApp is a leading provider of enterprise SAN solutions, delivering the high performance and reliability that business-critical applications demand. Here’s why NetApp SAN is an industry leader:

• High performance: NetApp’s all-flash SAN solutions deliver ultrafast performance, ensuring consistent low latency for your critical workloads.
• Cloud-Connected: NetApp’s hybrid cloud infrastructure provides flexible data movement and protection across cloud environments.
• Unmatched availability: NetApp delivers greater than six nines availability (99.9999%) to keep your business running smoothly.
• Lower TCO: NetApp lowers total cost of ownership (TCO) by reducing management costs and providing efficient storage.

NetApp works closely with industry partners like Brocade to deliver advanced SAN storage technologies. For instance, Brocade’s Fibre Channel solutions provide a scalable and high-performance foundation for SAN networks, easing the transition to NVMe-based SANs.

With a wide variety of SAN protocols and architectures available, choosing the right SAN storage solution depends on your specific needs, whether it's for virtualization, databases, or enterprise resource planning (ERP) systems. NetApp’s leading SAN solutions ensure top-tier performance, availability, and cloud integration to meet the demands of today’s business-critical workloads.

Discover how NetApp SAN solutions can help your business meet storage demands.