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System Architecture and Reliability

Among the ways of connecting storage, which describes a SAN (storage area network)?

  1. AA storage device with file server functions is connected to the LAN, and several clients share it in units of files
  2. BServers and storage are connected by a dedicated network, and a server uses the storage in units of blocks as if it were a disk attached to the server itself
  3. CDisks inside a server, or connected directly to a server by cable, are used only by that server
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Answer: B. Servers and storage are connected by a dedicated network, and a server uses the storage in units of blocks as if it were a disk attached to the server itself

A SAN connects servers and storage with a dedicated network (such as Fibre Channel or iSCSI, which uses an IP network), and a server uses areas of the storage in units of blocks as if they were its own disks. It is widely used for databases and virtualization platforms that need performance. Sharing a storage device connected to the LAN in units of files is NAS, and connecting storage directly to a server is DAS (direct-attached storage).

  • A. This describes NAS (network-attached storage).
  • B. Correct. A dedicated network is used, with access in units of blocks.
  • C. This describes DAS (direct-attached storage).
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