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5.25" Intel? P M/ Celeron M, LVDSx2, Dual PCIe
5.25" Intel? P M/ Celeron M, LVDSx2, Dual PCIe
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01.486 Industrial Baby AT Motherboard, 8MB SDRAM
02.5.25" Intel? Core?2 Duo CPU, Dual VGA, LVDS
03.200W ATX DCDC Isolated Power Supply 10-32Vin
04.486 Industrial Baby AT Motherboard, 32MB SDRAM
05.Intel 486DX4-100 CPU
06.ESA 486 Motherboard, Industrial Baby AT, 0k Cache
07.486 Industrial Baby AT Motherboard, 128MB SDRAM
08.CPU Heatsink & Fan, Custom for ESA TF-486 Motherboard
09.ESA 486 Motherboard, Industrial Baby AT, 512k Cache
10.Hard Drive, IDE, 2Gb+
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Direct Attached Storage Direct Attached Storage

DAS is ideal for local data sharing in businesses with a single non-enterprise server or few servers that share information across short distances. Typical applications for small companies include file serving and email. DAS is also used in larger organizations alongside NAS and SAN storage appliances.

A DAS system connects directly to a computer with a host bus adapter (HBA). Typically, the system contains one or more hard disk drives (HDD). No network interface is utilized. This differentiates DAS from Network Attached Storage (NAS). Since DAS is directly connected to a computer, other computers must access the DAS computer in order to utilize the DAS storage appliance. Some DAS systems provide concurrent access ports for sharing between computers. Drive protocols for DAS systems include ATA, Fibre Channel, SAS, SATA, and SCSI.

A DAS system is easily managed through the local computer operating system. Benefits include modest startup costs, streamlined security management, and less contention for resources. DAS offers a performance advantage over a typical SAN by insuring dedicated service to a single application. Disadvantages, in contrast to NAS and SAN storage, include the inability to share data or unused resources with other servers, lack of controller redundancy, cooling redundancy, and storage fault tolerance patterns (RAID). DAS expansion costs are linear while SAN costs per Gb actually go down as the system size grows. The larger DAS expansion expense is due to the necessary addition of redundant hardware which is part of each standalone appliance. Build or fine-tune your DAS system with ESA's configurator.

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