Differences between SAN, NAS, And DAS

Differences between SAN, NAS, And DAS

※Today, I am free to sort out the SAN, NAS, and DAS-related things and share them with you. If there is any error, I hope you will forgive me and give me more corrections.

In network storage, there are various network storage solutions, such as SAN, NAS, and DAS storage networks. They have their own characteristics and their application scenarios are also different. The following describes their respective features.

I. SAN

A Storage Area Network (SAN) is a high-speed, dedicated Network for Storage operations. It is generally independent of a computer LAN ). SAN connects hosts (Management Servers, business servers, etc.) with storage devices to provide dedicated communication channels for any host and any storage device. SAN isolates storage devices from servers to share storage resources at the server level. SAN introduces channel and network technologies into the storage environment and provides a new network storage solution that can meet throughput, availability, reliability, scalability, and manageability requirements.

Typically, a SAN consists of a disk array (RAID) connected Fiber Channel (to distinguish it from an ip san, also known as a FC-SAN ). SAN and server and client data communication uses SCSI commands instead of TCP/IP. Data Processing is block level ). SAN can also be defined as a data storage center. It adopts a scalable network topology and uses a direct connection mode with high transmission rates through optical channels, provides multiple data exchanges between any node in the SAN, and centrally manages data storage in a relatively independent storage area network. SAN will achieve maximum data sharing and Optimized Data Management under multiple operating systems, as well as seamless system expansion.

Among them, SAN network is subdivided into FC-SAN network and IP-SAN network.

1. FC-SAN

FC-SAN, as its name suggests, is to directly connect to the disk array through the FC channel, data directly communicates with the hardware by sending SCSI commands, thus improving the overall rate.

The composition of the FC-SAN:

There are some dedicated hardware and software in the FC-SAN. The Hardware includes the FC card, fc hub, FC switch, and storage system. The software is mainly the FC controller driver and storage management software for various operating systems.

① FC card: it is mainly used for the connection between the host and the FC device.

② Fc hub: the internal operation of the arbitration ring topology, the nodes connected to the HUB share 100 MB/S band width (or higher ).

③ FC switch: the Fabric topology is run internally. Each port occupies an exclusive 100 MB/S band width (or higher ).

④ FC storage device: one or more FC interfaces can be connected. FC storage devices usually use fiber-optic hard disks, as well as fiber-to-SCSI solutions. Using SCSI (or ATA) hard disks, the entire configuration is cheaper.

⑤ Storage network management software: the main function of the storage management software is to automatically discover the network topology and ing. It is automatically discovered and configured when the storage network is increased or decreased.

High Performance Fiber Channel switch and fiber channel network protocol is the key of FC-SAN. The network topology with the fiber channel switch as the backbone is called "SAN Fabric ". Fiber Channel Protocol is another essential feature of FC-SAN. FC-SAN is the use of fiber channel protocol attached to the SCSI protocol to achieve reliable block-level data transmission.

Application scenarios of FC-SAN:

Since FC-SAN is optimized to transfer large volumes of data between servers and storage devices, it is ideal for the following applications:

① Key task database applications. The predictable response time, availability, and scalability are the basic elements. <喎?http: www.bkjia.com kf ware vc " target="_blank" class="keylink"> VcD4KPHA + signature/Signature + signature + cjxwpiagicago/Signature + jrL/Jyrm05rSi0 + vWsb3T1ve7 + signature/q3/Signature + 4MDroaM8L3A + cjxwPiAgIDxzdHJvbmc + release/release + MLnu/release + 39PQs/release/Lbgz9TW + release/release + 2 + release + rrN1tC2z9Prt/release + ICAgICDA + release/release/6aGjzai5/release + release/Tw9Payv2 + release + L/release + c1_vcd4kpha + ICAgICC/release + tTQ1NJz + DBrLXEz9/Aws/ release + release/By7f + zvHG97XEsr/release + release/J0tS4/LrDtdi/release + 9 PDuN +/yb +/transfer + 3b/ptb3G89K1vLbK/release /samples/qs/samples + s6GjPGJyPgo8L3A + samples/samples + rHtoaM8YnI + c?vcd4kpha + ICAgICAgz/G54s/samples + samples /release +/release/rrNt/7O8bL6xre/release + release/X3M/fuL3K9NPaxLO49rf + release/release + release/Kx9K7uPa0 + NPQyt23/release/rf + release/ signature + signature/Signature/bf + signature/zbunu/Signature + signature + NDQzsS8/rmyz + 3KsaOs1PLA + signature/nT2rLZ1/fPtc2ztcTOxLz + signature + NDQ0KHOxLz + vLa1xLmyz + release + c?vcd4kpha + release + MLnzsS8/s + release/az/K/release/rf + release/release + vLa1xLf + release + 3b/ptcSy48Pm0 + vL/release + release + Cjxw PiAgICAgIDxzdHJvbmc + release + MLnvavOxLz + yv2 + release/zbunu/release + release/release + export/yb +/tcTOxLz + vLbK/release + release/ qp7XEzsS8/rmyz + release/release + release/7O8cb3yc/release + zvHG97G + release/release + rnK1c + jrMr9vt2yu7/release + examples/examples/1bzksrvE3NTat/examples/ycTc1Oyzyc/examples + CjxwPiAgICAgIKLcyv2 + examples + labels = "1" height = "312" width = "719" cellpadding = "1" cellspacing =" 1 ">FC-SAN, IP-SAN, NAS, DAS differences DASNASFC-SANIP-SANCostLowRelatively lowHighRelatively highData transmission speedFastSlowExtremely fastFastScalabilityScalabilityRelatively lowEasy to expandMost scalableServer access storageDirect access to storage data blocksAccess by fileDirect access to storage data blocksDirect access to storage data blocksServer system performance overheadLowRelatively lowLowRelatively highSecurityHighLowHighLowCentralized storage management?NoYesYesYesBackup EfficiencyLowRelatively lowHighRelatively highNetwork Transmission ProtocolNoneTCP/IPFiber ChannelTCP/IP: