Storage area network

A storage area network (SAN) is a high-performance, dedicated network that connects multiple servers to centralized storage devices. SANs are widely used in enterprise environments to overcome limitations of local storage, such as capacity constraints and slow data access speeds.

By centralizing storage, SANs enable organizations to manage large volumes of sensitive data more securely and efficiently. This architecture supports scalability, allowing businesses to expand storage as data demands grow. This is especially critical in industries handling customer information, financial records or encrypted datasets.

Learn more about how storage area networks are used and how they can be tailored to your needs, or contact Micron’s Sales Support team to find out more.

What is a storage area network?

Storage area network definition: A storage area network is a specialized high-speed network that connects servers to shared storage devices, allowing them to access and manage data as if it were stored locally, using block-level access.

To understand how SANs differ from other storage systems, it’s helpful to compare block-level and file-level access. SANs operate at the block level, meaning they manage data in raw chunks that applications can format and organize as needed. This allows for high-performance, low-latency access, which is ideal for databases, ​virtual machines and transactional systems. 

In contrast, file-level access — used in network attached storage (NAS) systems — presents data as files and folders, making it easier for users to navigate and share but less efficient for intensive workloads. 

Think of block-level access like organizing a library by page numbers for precision, while file-level access is like shelving books by title for convenience.

The main purpose of storage area networks is to centralize storage devices to make them easier to maintain and access. This architecture and implementation provide some key benefits:

• Centralized management of storage resources: SANs allow IT teams to manage storage from a single interface, streamlining operations and reducing administrative overhead. This centralized control also improves visibility into data usage, performance and capacity planning, which is essential for optimizing enterprise workloads and reducing operational risk.
• Enhanced data protection through remote storage: By decoupling storage from local devices, storage area networks reduce the risk of data loss due to hardware failure or localized disruptions. Remote storage also enables advanced encryption, access controls and redundancy strategies that help meet compliance standards in regulated industries.
• Scalability to support growing data volumes: Storage area network architectures are designed to scale horizontally, allowing organizations to expand storage capacity seamlessly as data demands increase. This is especially critical for sectors like AI, healthcare and finance, where data growth is exponential and performance requirements are high.
• Reliable backup and disaster recovery capabilities: Storage area networks ensure data availability even during outages or system failures through automated backup routines and replication across multiple storage nodes. This resilience helps maintain business continuity and supports recovery time objectives (RTOs) and recovery point objectives (RPOs) in enterprise environments.

How does a storage area network work?

Storage area networks (SANs) use dedicated, high-speed network connections to link servers with shared storage devices, enabling fast and reliable data exchange. By separating storage traffic from general network activity, storage area networks help reduce congestion and improve overall system performance.

Storage area networks support three primary data pathways:

• Server-to-storage: Enables multiple servers to access shared storage simultaneously, improving efficiency.
• Server-to-server: Enables low-latency, high-volume communication between servers.
• Storage-to-storage: Allows direct data transfer between storage devices, freeing server resources for other tasks.

This architecture minimizes bottlenecks and ensures high-speed, uninterrupted data access.

What is the history of storage area networks?

The evolution of storage area networks reflects the growing need for scalable and secure ​data storage:

• 1970s, birth of storage solutions: The era of direct attached storage (DAS) led to data silos, as servers required dedicated local storage.
• 1980s, emergence of network attached storage: As IT infrastructure matured, NAS enabled file sharing over local networks.
• 1990s, introduction of storage area networks: Storage area networks allowed multiple servers to access shared storage as if it were locally attached, solving many DAS limitations.
• 2000s, growth of storage area networks: The exponential rise in data needs made storage area networks a core part of enterprise IT infrastructure.
• 2010s, evolution alongside cloud storage: Storage area networks were adapted to support cloud environments, enhancing their scalability and flexibility. This evolution allowed storage area networks to integrate with modern data architectures, making it possible to manage large volumes of data efficiently across both on-premises and cloud platforms.

What are the key types of storage area networks?

SANs use different protocols that affect performance, cost and infrastructure compatibility. The protocols used within a specific SAN define how data is transferred between servers and storage devices. 

Protocols can vary based on different factors such as speed, cost and the infrastructure of the network itself.

Internet small computer system interface (iSCSI)

iSCSI is ideal for physical networks due to its use of transmission control protocol/internet protocol (TCP/IP), making it cost-effective and easy to deploy over existing Ethernet infrastructure.

Fiber channel protocol (FCP)

Originally used in supercomputing, FCP is now the standard for storage area networks due to its high throughput and low latency. It supports mission-critical workloads and is widely adopted in enterprise environments.

Non-Volatile Memory Express (NVMe™) over fiber channel

NVMe over fiber channel enables ultra-fast data transfers over PCIe® buses, combining the speed of NVMe with the reliability of fiber channel. It’s ideal for artificial intelligence, machine learning and real-time analytics workloads.

How are storage area networks used?

Storage area networks are versatile and widely adopted across industries to consolidate storage, reduce costs and improve data access. Organizations use storage area networks to store large volumes of data — ranging from financial records to encrypted datasets — securely and efficiently.

SANs are often used to support data lakes, where vast amounts of structured and unstructured data are stored for analysis and backup. Their speed and reliability make them ideal for high-performance computing, virtualization and enterprise applications.

SANs also play a critical role in data protection, enabling organizations to replicate sensitive data to secondary storage devices for backup and disaster recovery.