Direct Attached Storage (DAS) refers to computer storage that is directly connected to a computer via PCIe, SATA, SAS, eSATA, NVMe or USB and is not directly accessible from other computers. In professional environments, the individual hard disks in a server are referred to as direct attached storage, which also applies to external mass storage devices (raid systems, HDD/SSD expansion boxes that are directly connected to the server via SCSI, SATA and SAS interfaces). Such storage typically enables higher performance than network storage because data to be read or written is not slowed down by networks. Security problems also no longer exist, since failures have become extremely rare due to the use of software and hardware raids, and in particular the ZFS file system and redundant power supplies.
Our storage expansion boxes (JBODs) have redundant, highly efficient power supplies and can be equipped with four to ninety 2.5"/3.5" drives. As a rule, they are connected via intelligent SAS backplanes and are usually also suitable for connection to several servers, each of which reserves a portion of the units for itself and can be taken over by another server automatically or by manually changing external SAS connections in the event of an error. Operation continues virtually without delay, or after a short interruption.
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