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High performance remains a SAN requirement and flash-based fabric protocols are helping to close the gap between fibre speeds and slower IP. Operational environment: NAS uses TCP/IP networks, commonly known as Ethernet, whereas SANs run on high-speed fibre channel networks, although more SANs are adopting IP-based fabrics because of the high cost of fibre networks.The key differences between NAS and SAN are listed below. SANs are not dependent on the LAN and relieve pressure on the local network by offloading data directly from attached servers.

Servers primarily identify SAN as local attached storage, so multiple servers can share a storage pool. High-end enterprise SANs may also include SAN directors for high performance and efficient utilisation of capacity. The network interconnects storage devices, switches and hosts. SAN is a dedicated high-performance network for consolidated block level storage. ASIC based NAS: In this, NAS is deployed with a single ASIC chip, using hardware to implement TCP/IP and the file system.įigure 2: Typical Network attached storage (NAS) infrastructure The difference between NAS and SAN.Embedded system based NAS: In this category, MIPS or ARM based processor architecture using RTOS (Real Time Operating System) or an embedded operating system is used to run a NAS server.Computer based NAS: This is deployed using a computer via FTP/SMB/software server.NAS devices are classified into the following three categories.

NAS drives: SCSI is used as default, and various other mediums like ATA disks, optical disc and magnetic media are also supported via NAS.

NAS connections: Varied mediums are used for establishing connections with NAS servers like Ethernet, optical fibre and even wireless communication standards like 802.11.

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NAS supports the HTTP/HTTPS protocol, and end users can even download the files using NAS, if connected via a LAN. The initial purpose of NAS design was file sharing over UNIX across LAN. Reliable communication can be achieved through TCP/IP. NAS also supports numerous different network protocols like SCP and FTP. NAS protocol: NAS servers fully support the network file systems and the common interface file systems.NAS allows organisations to store and retrieve humongous amounts of data at an affordable price. Nowadays, organisations search for reliable data storage methods, which can be managed and controlled with their established network systems. It provides a widely supported storage system for any organisation requiring a reliable network system. NAS is regarded as a complete system designed for heavy network systems, which may be processing millions of transactions per minute. Network attached storage removes the responsibility of file serving from other servers on the network and provides access to files using network file sharing protocols like NFS (network file system), SMB (server message block) or AFP (Apple file protocol). NAS systems are networked appliances that contain one or more storage drives, often arranged into logical, redundant storage containers or RAID (redundant array of inexpensive disks). As compared to traditional file serving and direct attached storage, NAS provides advanced functionalities in terms of data storage, access and management. Network attached storage is regarded as a dedicated server, also termed appliance, used for file storage and sharing.

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A group of Auspex engineers split away to create the integrated network appliance ‘filer’, which supported both Windows and UNIX, in the early 1990s, starting the market for proprietary NAS arrays. While 3Server was among the first firms to build a dedicated NAS for desktop operating systems, Auspex Systems was one of the first to develop a dedicated NFS server for use in the UNIX market. Inspired by the success of file servers from Novell, IBM and Sun, several firms developed dedicated file servers.

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3Com and Microsoft developed the LAN Manager software and protocol to further this new market.

3Com’s 3Server and 3+Share software were the first purpose-built servers (including proprietary hardware, software and multiple disks) for open systems servers, and the company led the segment from 1985 through the early 1990s. In the UNIX world, Sun Microsystems’ 1984 release of NFS allowed network servers to share their storage space with networked clients. Network attached storage (NAS) was introduced in 1983 with Novell’s early file sharing NetWare server operating system and NCP protocol. This article gives a brief on some of the best OSS for network attached storage. It gives access to files using network file sharing protocols like NFS, SMB or AFP. Network attached storage is a dedicated appliance used for file storage and sharing, which provides advanced functionalities for data storage, access and management.

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