SAN Storage: Storage Area Network Systems for Business

SAN storage is a centrally managed, high-speed network of block storage that presents volumes to one or more servers over a dedicated network. Servers see each volume as if it were a locally attached disk, but the capacity is pooled, shared and managed in one place. It is the standard choice for databases, virtualised environments and other workloads where low latency and consistent performance matter most.

This page explains how a SAN is built, what to check before you buy, and when a simpler option will do.

Buying guide: what to look for in SAN storage

A SAN is a system, not a single box. Plan the whole path from server to disk.

Protocol: Fibre Channel or iSCSI. Fibre Channel runs on dedicated hardware and delivers high throughput, with link speeds that start around 4Gbps and go up to 128Gbps and beyond. iSCSI carries storage traffic over ordinary Ethernet, which makes it cheaper and easier to deploy, at the cost of somewhat higher and less predictable latency, especially on a congested network. Fibre Channel over Ethernet and NVMe over fabrics are further options for newer builds.

Host connectivity. Fibre Channel servers need host bus adapters. iSCSI servers can often use standard network adapters with a software initiator, or offload cards for better performance. Count the ports you need on every host.

SAN switches. The switch is the central part of a Fibre Channel fabric. Some smaller systems can be cabled directly to a host without a switch, but a switch lets many servers reach the same storage and adds paths for resilience.

Storage array. The array provides the drives, controllers and RAID. Consider media type (flash, hybrid or disk), controller redundancy, capacity growth and whether replication and snapshots are included or licensed separately.

Zoning and LUN masking. Zoning is set on the switch and limits which devices can talk to each other. LUN masking is set on the array and limits which servers can see which volumes. Together they keep a shared SAN safe for many hosts at once.

Multipathing and redundancy. Use more than one network path between servers and storage, so a failed cable, port or switch does not take applications offline.

Budget. Add the array, switches, adapters, optics, cabling, licences and support. The array is only part of the bill.

SAN storage products and brands

A SAN usually combines an array, switching and host adapters. Enterprise arrays such as the Lenovo Storage V series and HPE Modular Smart Array families support Fibre Channel, iSCSI or both. Fibre Channel switches such as Brocade models connect servers and storage into a fabric, including NVMe-ready options for all-flash builds. Fibre Channel adapters, SFP transceivers and cabling complete the path.

Product lines change often, so check the current listings for exact models and compatibility.

Who SAN storage suits

• Databases and ERP. Block-level access with low latency suits transactional systems.
• Virtualisation clusters. Several hosts can share the same volumes, which supports moving virtual machines between servers.
• Growing server estates. Pooling storage avoids stranded capacity inside individual servers.
• Business-critical applications. Redundant paths and controllers support high availability.
• Replacing scattered local disks. Central management brings monitoring, capacity planning and snapshots into one place.

SAN is more than many small teams need. If you only want shared office files, a NAS is simpler. If one server needs capacity, direct attachment is cheaper.

SAN, NAS and DAS compared

For shared files and backup, NAS storage is usually the more economical answer. For one server, DAS storage keeps things simple. To choose the drives and controllers behind a SAN, browse our storage arrays.

Why buy SAN storage from PonDesk

PonDesk sources genuine, verified storage hardware through industry channels, so the SAN components you specify are what arrive. We aim to price competitively, which matters when a SAN needs arrays, switches and adapters. Free delivery applies on UK orders. If you are designing a larger fabric or placing a bulk order, contact us and we can help match components.

SAN storage questions, answered

What is SAN storage?

SAN storage is a dedicated, high-speed network that delivers block storage to servers. A storage area network pools capacity in arrays and presents it as volumes, called LUNs, that servers treat like local disks. SANs typically use Fibre Channel or iSCSI and are built for databases and virtualisation.

What is the difference between SAN and NAS?

SAN delivers block-level storage over a dedicated network, while NAS delivers file-level storage over a standard network. SAN suits databases and virtual machines that need low latency. NAS suits shared files and backup and is simpler to set up. Some modern systems can offer both.

Fibre Channel or iSCSI: which is better for a SAN?

Fibre Channel is better for the highest performance and predictable latency, while iSCSI is better for lower cost and easier deployment. iSCSI uses ordinary Ethernet switches and adapters, but latency can vary on shared networks. Choose based on workload demands, budget and your team's skills.

What do I need to build a SAN?

A SAN needs servers, a storage array, and a way to connect them. For Fibre Channel that means host bus adapters, Fibre Channel switches, optics and cabling. For iSCSI it means Ethernet adapters and switches. Some smaller systems can connect to a host directly without a switch.

What is a LUN in SAN storage?

A LUN, or logical unit number, is a volume of storage that the array presents to a server. The server sees the LUN as a local disk. LUN masking on the array controls which servers can see each LUN, which keeps shared storage secure.

Ready to choose your SAN storage?

Define your workload, protocol, host count and growth plan, then compare arrays, switches and adapters that fit. If your needs are simpler, see NAS storage for shared files or DAS storage for one server, or contact us for help sizing your SAN.