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Both NAS and SAN can be accessed through a VPN for securityĪlmost any machine that can connect to the LAN (or is interconnected to the LAN through a WAN) can use NFS, CIFS or HTTP protocol to connect to a NAS and share files. NAS uses TCP/IP Networks: Ethernet, FDDI, ATM (perhaps TCP/IP over Fibre Channel someday) Which will be faster? Even with overhead? It's something to consider. So a Gigabit Ethernet gives you throughputs of 600-800 Mbps rather than 1000Mbps.But consider this: the next version of SCSI (due date ?) will double the speed the next version of ethernet (available in beta now) will multiply the speed by a factor of 10. Why? Mainly, people will say the TCP/IP overhead cuts the efficiency of data transfer. For instance, one common argument is that SCSI is faster than ethernet and is therefore better. Most people focus on the wires, but the difference in protocols is actually the most important factor. For a quick introduction to the technology, take a look at the diagrams below. However, there are differences - important differences - that can seriously affect the way your data is utilized. After all, both NAS and SAN generally use RAID connected to a network, which then are backed up onto tape. That the storage is remote, and computers request a portion of anĪt first glance NAS and SAN might seem almost identical, and in fact many times either will work in a given situation. Uses file-based protocols such as NFS or SMB/CIFS where it is clear Network-attached storage ( NAS ), in contrast to SAN, High-speed block-level access to the hard drives such as email servers,
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Include provision of transactionally accessed data that require Storage space onto the disk arrays. Common uses of a SAN Planned sharing of data on different computers within a LUN requires advanced solutions, such as SAN file systemsor clustered computing.ĭespite such issues, SANs help to increase storageĬapacity utilization, since multiple servers consolidate their private These would interfere with each other and quickly corrupt the data. If multiple systems were simply to attempt to share a LUN,
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Operating systems maintain their own file systems on their own dedicated, non-shared LUNs, as though they were local to themselves. Essentially, a SAN consolidates such storage islands together using a high-speed network. External Chassis connected to more than one Server via a Cable.ĭata centers first created “islands” of SCSI diskĪrrays as direct-attached storage (DAS), each dedicated to anĪpplication, and visible as a number of “virtual hard drives” (i.e. External Chassis of Disks connected to a Server via a Cable (SCSI or Fiber Channel) Libraries, and optical jukeboxes, accessible to servers so that theĭevices appear like locally attached devices to the operating system. SANsĪre primarily used to make storage devices, such as disk arrays, tape SAN (Storage Area Network) is storage product of IBM which provides dedicated network to block level data storage.