A NAS can become an important part of a business storage environment. The platform should be selected around the data, users, applications and expansion requirements.
Practical example: NAS, DAS or SAN?
For shared office files, NAS is often the natural architecture to evaluate first.
Scenario: A 25-user office needs shared departmental files, central backup storage and controlled user access.
A NAS is a natural candidate because it provides file services over the existing network. A directly attached enclosure would tie the storage more closely to one host. A SAN would make more sense where servers require shared block storage, for example in a more complex virtualisation environment.
Decision: For this example, start by evaluating NAS capacity, drive type, network speed, snapshots and backup replication. Do not deploy SAN architecture merely because it sounds more enterprise.
Common mistakes and selection checklist
Common mistakes
- Choosing NAS, DAS or SAN because one architecture sounds more enterprise rather than because it fits the workload.
- Sizing storage only by terabytes and ignoring IOPS, throughput, network speed, snapshots and backup.
- Using one storage system as both primary data and the only backup copy.
What happens if you get it wrong?
Users can experience slow file access or applications can be constrained by the wrong storage path. More importantly, a storage failure or data-loss event can affect both production data and the supposed recovery copy.
Selection checklist
- Decide whether applications need file storage, block storage or storage attached to one host.
- Estimate current usable capacity and realistic growth.
- Identify performance, network and concurrency requirements.
- Check drive type, RAID options, snapshots and expansion.
- Design backup and off-system recovery independently.
A resilient array keeps services available during some drive failures. Separate backups provide recovery from deletion, corruption, malware and site loss.
Centralised storage
A NAS can provide a central storage location that authorised users and systems access over the network. This can simplify shared file storage compared with keeping data distributed across individual computers.
Storage capacity
Capacity depends on the number and size of installed drives and the chosen storage configuration. Usable capacity is not necessarily the same as raw drive capacity.
Network performance
The NAS network connection and the rest of the network path influence how quickly users and systems can access data.
Plan for backup
A NAS can be a useful backup target, but important data should not depend on one physical storage system. Backup copies should be designed around the risks the business needs to address.
Choose the NAS around the requirement
Drive bays, storage capacity, network connectivity, workload and future growth should all be considered before selecting a specific NAS.
Confirm the exact product specification, supported configuration and compatibility before ordering. Platform generation, firmware, licences and optional components can change what a product supports.