NAS vs. SAN: File Storage, iSCSI, and Which One You Need
A NAS serves shared files through protocols such as SMB and NFS. A storage area network, or SAN, presents block storage that a server sees and manages like a local disk.
For shared folders, computer backups, media libraries, and collaborative files, NAS is the practical choice. When one server or workstation needs a disk-like network volume, the UGREEN NASync DXP2800 GT or DXP4800 GT can provide it through iSCSI. A full SAN becomes appropriate when several hosts require shared block storage with redundant controllers, network paths, and enterprise support.
What Is the Real Difference Between NAS and SAN?
When a computer opens a file stored on a NAS, it sends a file request to the NAS. The NAS owns the filesystem, locates the requested data, applies user permissions, and returns the file through SMB or NFS.
A SAN works differently. The storage system presents a Logical Unit Number, or LUN, to a server. The server sees that LUN as a disk, creates a filesystem on it, and decides how files are organized. The SAN transfers blocks without managing the files stored inside them.
This is why NAS fits collaborative file access so naturally. SAN storage is built around servers and applications that control their own block volumes.
NAS vs. SAN at a Glance
| Difference | NAS | SAN |
|---|---|---|
| Access method | File-level access | Block-level access |
| Common protocols | SMB and NFS | iSCSI, Fibre Channel, and NVMe over Fabrics |
| Filesystem owner | The NAS | The connected server |
| What the client sees | Shared files and folders | A disk or logical unit number |
| Best fit | Shared files, backups, media, and team folders | Virtualization, databases, clusters, and latency-sensitive server storage |
| Network | Standard Ethernet | Ethernet or a dedicated Fibre Channel fabric |
| Multi-user access | Built for multiple users to share the same files | Requires cluster-aware software when multiple hosts share one LUN |
| Availability | Depends on the NAS, RAID, network, and backup design | Can use redundant controllers, switches, fabrics, and multipathing |
| Administration | Lower setup and maintenance burden | More design, monitoring, and specialist knowledge |
Which Storage Architecture Fits Your Workload?
Use NAS file sharing when several people or devices need access to the same folders.
SMB and NFS are designed for this job. The NAS controls permissions and file access while computers, phones, and media devices work with familiar folders. Users do not need to format LUNs, manage initiators, or decide which computer owns the filesystem.
A SAN adds complexity without improving a household backup, media library, or small-office file share. File services are the direct answer to those needs.
One server or workstation needs a disk-like volume
iSCSI fits when one machine needs storage that behaves like a locally attached disk.
Possible uses include:
- A dedicated application server
- A game library or application volume, where software expects a local disk rather than a network share
- A workstation that requires block storage
- A single virtualization host
- A home-lab server
A 2.5GbE connection is sufficient for many light single-host workloads. For larger transfers or heavier disk activity, the 10GbE UGREEN NASync DXP2800 GT provides a compact two-bay starting point with SAN Manager and two M.2 slots.
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Where UGREEN SAN Manager Fits
On the DXP2800 GT and DXP4800 GT, UGREEN SAN Manager provides iSCSI block storage alongside SMB and NFS file services. The same NAS can therefore support different access models for different workloads.
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In SAN Manager, an administrator can create a LUN, make it available through an iSCSI Target, identify clients by IQN, organize clients into groups, assign access permissions, and enable CHAP authentication. The connected server then formats and manages that LUN as a disk.
This combination fits users who need one or a few block volumes for a workstation, server, or home lab without requiring a redundant enterprise storage fabric. The DXP2800 GT offers a compact 10GbE starting point, while the four-bay DXP4800 GT provides more RAID flexibility and network capacity for heavier workloads.
Both systems provide iSCSI from a single NAS appliance. SAN Manager does not add dual storage controllers or separate SAN fabrics. If a service must continue operating after a NAS controller or enclosure failure, use storage architecture designed with controller-level redundancy.
If SAN Manager fits your workload, compare current UGREEN NAS specifications to select the appropriate bay count, network configuration, and storage capacity, or browse and filter UGREEN NAS storage models directly.
Frequently Asked Questions
Is iSCSI NAS or SAN?
iSCSI is a block-storage protocol commonly used to build IP-based SAN connections. A NAS appliance can operate as an iSCSI Target while continuing to provide SMB and NFS file shares.
Can two computers connect to the same iSCSI LUN?
Two computers can connect when a cluster-aware filesystem or application coordinates concurrent access. Mounting the same writable LUN as an ordinary local disk on two independent computers can corrupt the filesystem.
Does UGREEN NAS support iSCSI?
Yes. The UGREEN NASync DXP2800 GT and DXP4800 GT support iSCSI through SAN Manager. They can present block storage to a server or workstation while continuing to provide SMB and NFS file services.
Can NAS and SAN be used together?
Yes. A business can use NAS shares for documents and collaborative files while using SAN storage for databases, virtual machines, or applications that require block access. The DXP2800 GT and DXP4800 GT can also provide file shares and iSCSI LUNs from the same appliance.
