NAS vs SAN — Which Storage Is Right for Your Workload?
File storage vs block storage, in plain language — with clear guidance on when to use each.
NAS (Network Attached Storage) and SAN (Storage Area Network) solve different problems. NAS serves files over your existing Ethernet network using protocols like NFS and SMB; SAN serves raw block storage to servers over a dedicated high-speed fabric (Fibre Channel or iSCSI), appearing to the server as a local disk.
Choosing wrongly leads to either wasted budget or a performance bottleneck. Here is how they compare and when each makes sense.
NAS vs SAN — Side by Side
| Aspect | NAS | SAN |
|---|---|---|
| Storage type | File-level (NFS, SMB/CIFS) | Block-level (FC, iSCSI) |
| Network | Standard Ethernet / existing LAN | Dedicated fabric (FC or iSCSI SAN) |
| Appears to server as | A network share / mounted folder | A local disk (LUN) |
| Typical use | File shares, backups, media, departmental storage | Databases, virtualization, low-latency workloads |
| Performance ceiling | Good; depends on LAN | Highest; low latency, high IOPS |
| Complexity & cost | Lower — simpler to deploy | Higher — dedicated fabric & switches |
| Scalability | Easy for capacity | Excellent for performance + capacity |
Choose NAS when
- You need shared file access for teams (documents, media, project files).
- You want simple, cost-effective storage that uses your existing Ethernet network.
- Backups, archives and file-serving are the primary use case.
- You value easy setup and management over absolute lowest latency.
Choose SAN when
- You run databases, ERP or virtualization (VMware/Hyper-V) that need block storage and low latency.
- You need very high IOPS and consistent performance under load.
- You are building a clustered/high-availability environment with shared block volumes.
- Centralised, high-performance storage for many servers justifies a dedicated fabric.
The Verdict
Use NAS for shared files, backups and simplicity; use SAN for databases, virtualization and the highest performance. Many organisations run both. Serverwale supplies refurbished NAS and SAN storage (Dell PowerVault and more), tested and warranted — tell us your capacity and IOPS needs and we will design the right solution.