What are the advantages and disadvantages of direct attached storage?

Advantages of direct-attached storage: the configuration cost is the lowest, because the scheme only needs to connect the storage device to the server through SCSI interface, and the configuration is very simple, which is suitable for small companies.

Disadvantages of direct attached storage: Because the overall configuration is too simple, this scheme also has some shortcomings. If the server fails, the data can't be accessed to the multi-server system, which is inconvenient to manage and the storage space can't be controlled and allocated, which will cause a waste of resources. Storage backup operations are complicated.

Extended data:

Classification of direct attached storage:

Direct attached storage can be divided into internal direct attached storage and external direct attached storage.

Internal direct-attached storage refers to the direct integration of storage devices and servers through serial or parallel SCSI bus of 1: 3 cable, but the SCSI bus itself has the limitations of transmission distance and mounting devices.

External direct-attached storage directly connects the server with external storage devices through SCSI or Fibre Channel. Compared with internal direct-attached storage, external direct-attached storage can overcome the limitations of transmission distance and installation equipment through Fibre Channel.

For a small number of PCs or servers, using direct-attached storage connection is simple, easy to configure and manage, and the cost is low. However, in this connection mode, because each computer has its own storage disk, it is not conducive to the full utilization of storage capacity and the enjoyment of data between servers, and the storage system has no centralized and unified management scheme, which is not conducive to data maintenance. Therefore, direct attached storage is not suitable as an enterprise storage solution.