DAS Storage: Direct Attached Storage for Servers and Workstations

DAS storage is capacity wired straight to one server or workstation, with no network or switch in between. Once connected, the drives behave as though they sit inside the host machine. That makes direct attached storage the simplest and often the cheapest way to add fast capacity when a single system needs it. If several servers or users must share the same data, a networked option is the better fit.

This page explains how DAS works, what to check before you buy, and when it is the right choice compared with shared storage.

Buying guide: what to look for in DAS storage

Most mistakes with direct attached storage come from picking an enclosure first and the workload second. Work through these points in order.

Interface. The link between the enclosure and the host sets your ceiling. Common options are SAS, SATA, eSATA, USB and Thunderbolt. SAS is the usual choice for servers, while Thunderbolt and USB are more common on workstations. Check that the host has a matching port or a suitable host bus adapter before you order.

Drive bays and form factor. Enclosures come in compact desktop units and rackmount shelves, such as 2U twelve-bay designs. Choose a size that fits your rack, and make sure it takes the drive type you plan to use, whether 3.5 inch for capacity or 2.5 inch for speed and density.

RAID or JBOD. A JBOD enclosure presents drives as independent disks with no built-in protection. Multi-drive DAS units with RAID options add redundancy, and hot-swap bays let you replace a failed drive without taking the system down. If you choose JBOD, protection has to come from the host, such as a controller card or software RAID.

Expansion path. Some DAS systems can be chained together or attached through SAS expanders to grow capacity. Cascading is limited, though, so check how far your chosen platform can scale before you commit.

Power, space and cabling. An external enclosure needs its own power, rack space and cables. These are small costs for one unit and larger ones across many.

Support and compatibility. Confirm that the enclosure works with your server model, operating system and drive type.

DAS storage products and brands

Direct attached storage covers a wide spread of hardware.

Rackmount SAS disk enclosures are built for server environments that need dense, low cost-per-gigabyte capacity. Examples seen in the market include the HPE D6000 and D6020 disk enclosures. The D6020 uses 12Gb/s SAS and supports zoned direct attach, which lets administrators assign groups of drives to individual blade servers.

Standalone JBOD shelves from storage builders offer 2U and 4U formats with SAS links, designed to expand a host's capacity through a simple cable connection.

Desktop and workstation enclosures connect over Thunderbolt or USB. They suit video editing, large file libraries and local backup, and many include RAID and hot-swap bays.

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

Who DAS storage suits

DAS suits a single host that needs fast, dedicated capacity.

• Database and ERP servers. Direct connection keeps the data path short and the setup simple, which is why DAS is often used for databases, ERP systems and email services.
• Servers running out of internal bays. An external enclosure adds capacity without replacing the server.
• Workstations handling large media files. Video and design teams often prefer a fast local volume.
• Small teams on a budget. DAS is generally less expensive than SAN or NAS and does not need switches or complex administration. Setup is handled through the operating system.
• Backup and archive targets for one host. Cheap, high-capacity disks work well here.

DAS is a weaker fit when many people or systems need the same data. Only the host it is attached to can use it directly, and capacity can be awkward to grow once the enclosure is full.

DAS, NAS and SAN compared

The difference is how the storage reaches the machine that uses it.

If your users need to open the same files from different machines, move up to NAS storage. If many servers need fast, low-latency block access, look at SAN storage. If you want the drives and controllers in one managed unit with RAID built in, compare our storage arrays.

Why buy DAS storage from PonDesk

PonDesk sources genuine, verified storage hardware through industry channels, so the enclosure and drives you specify are what arrive. We aim to offer DAS storage at a competitive price, which matters when you are filling several bays. Free delivery applies on UK orders. For larger builds or bulk orders, contact us and we can help match the hardware to your server.

What is DAS storage?

DAS storage is a storage device connected directly to one server or workstation, without a network in between. Direct attached storage can be drives inside the host or an external enclosure linked by SAS, SATA, USB or Thunderbolt. Once attached, the host treats the drives as if they were installed internally.

What is the difference between DAS and NAS?

DAS connects to a single computer, while NAS connects to the network and shares files with many users. DAS storage is usually simpler and cheaper, but only the attached host can use it directly. NAS storage suits teams that need shared access to the same files from different machines.

Is DAS storage faster than NAS?

DAS storage is often faster than NAS for a single host because the data path is direct and does not depend on network bandwidth. NAS performance is limited by the network and the number of clients. Actual speed still depends on the interface, drive type and RAID setup in the DAS system.

Does DAS storage support RAID?

Yes, many DAS storage systems support RAID, but not all of them. Multi-drive DAS units often include RAID options and hot-swap bays to reduce downtime after a drive failure. A JBOD enclosure has no built-in protection, so redundancy has to come from the host controller or software.

Can you share DAS storage between servers?

Standard DAS storage serves one host, but some systems offer shared or zoned direct attach. Zoned designs let several servers connect to one enclosure and assign groups of drives to individual servers. If you need true shared access to the same data, NAS or SAN is usually a better fit.

Ready to choose your DAS storage?

Check your host ports, drive plan and RAID needs, then compare the enclosures that fit. If your needs go beyond one server, start with NAS storage or SAN storage, or get in touch and we will help you size it.