DAS, SAN & NAS

When it comes to enterprise data storage systems, the main options are direct-attached storage (DAS),
network-attached storage (NAS) and storage area networks (SANs).
Deciding which is right for your business depends on the following factors.

DIRECT ATTACHED STORAGE (DAS)

The storage server is
connected to another server
with a cable (e.g. SAS cable)
(point-to-point).
-
Fast connection.
- Spatially limited by the physical cable length.

NETWORK ATTACHED STORAGE (NAS)

Software sharing of storage (whether it consists of local hard disks, DAS or SAN) on the network via file protocol: NFS, SMB, AFP, FTP, SFTP, etc.
-
Easy to administer.
- Relatively slow) 1GB / 2GbE / 10 GbE.
- Arbitrarily expandable.
- File sharing.
- Higher security standards.

STORAGE AREA NETWORK (SAN)

Storage server is integrated via networkwork protocol (e.g. ISCSI, FC)

- Flexible.
- Spatial separation possible.
- Multipathing against overload.
- Redundancy.