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Differences between SCSI, ISCSI, FCP, FCoE, FCIP, NFS, CIFS, DAS, NAS and SAN

Latest reply: Oct 11, 2021 11:16:02 19737 12 9 0 2

Hello there, Community!


This post highlights the differences between SCSI, ISCSI, FCP, FCoE, FCIP, NFS, CIFS, DAS, NASand SAN. Let's see together below.


Differences between SCSI, ISCSI, FCP, FCoE, FCIP, NFS, CIFS, DAS, NAS, SAN


SCSI


Most storage networks use the SCSI protocol for communication between servers and disk drive devices. A mapping layer to other protocols is used to form a networkChannel Protocol (FCP), the most prominent one, is a mapping of SCSIover Ethernet (FCoE);, mapping of SCSI over TCP/IP.


SAN


A storage area network (SAN) is a dedicated network that provides access to consolidated, block level data storage. SANs are primarily used to make storage devices, such as disk arrays, tape libraries, and optical jukeboxesto servers so that the devices appear like locally attached devices to the operating system. Historically, data centers first created "islands" of SCSI disk arrays as direct-attached storage (DAS), each dedicated to an application, and visible as a number of "virtual hard drives" (i.e.). Operating systems maintain their own file systems on their own dedicated, non-shared LUNs, as though they were local to themselves.


If multiple systems were simply to attempt to share an LUN, these would interfere with each other and quickly corrupt the data. Any planned sharing of data on different computers within a LUN requires advanced solutions, such as SAN file systems or clustered computing. Despite such issues, SANs help to increase storage capacity utilization, since multiple servers consolidate their private storage space onto the disk arraysSharing storage usually simplifies storage administration and adds flexibility since cables and storage devices do not have to be physically moved to shift storage from one server to another.


SANs also tend to enable more effective disaster recovery processes. A SAN could span a distant location containing a secondary storage array. This enables storage replication either implemented by disk array controllers, by server software, or by specialized SAN devices. Since IP WANs are often the least costly method of long-distance transport, the Channel over IP (FCIP) and iSCSI protocols have been developed to allow SAN extension over IP networks. The traditional physical SCSI layer could only support a few meters of distance - not nearly enough to ensure business continuance in a disaster.


IP SAN


A competing technology to FCIP is known as IP SAN. It uses routing instead of tunneling to enable connectivity of Channel networks over IP. IP SAN uses TCP as a transport mechanism for storage over Ethernet, and iSCSI encapsulates SCSI commands into TCP packets, thus enabling the transport of I/O block data over IP networks.


NAS


Network-attached storage (NAS), in contrast to, uses file-based protocols such as NFS or SMB/CIFS where it is clear that the storage is remote, and computers request a portion of an abstract file rather than a disk block. The key difference between direct-attached storage (DAS) and NAS is that DAS is simply an extension to an existing server and is not necessarily networked. NAS is designed as an easy and self-contained solution for sharing files over the network.


It works with standard Ethernet cards, cables and switches to handle Channel traffic at the data link layer, using Ethernet frames to encapsulate, route, and transport FC frames across an Ethernet network from one switch with Channel ports and attached devices to another, similarly equipped switch.


When an end user or application sends a request, the operating system generates the appropriate SCSI commands and data request, which then go through encapsulation and, if necessary, encryption procedures. A packet header is added before the resulting IP packets are transmitted over an Ethernet connection. When a packet is received, it is decrypted (if it was encrypted before transmission), and disassembled, separating the SCSI commands and request. The SCSI commands are sentcontroller, and from there to the SCSI storage device. Becauseis bi-directional, the protocol can also be used to return data in response to the original request.


The channel is more flexible; devices can be as far as ten kilometers (about six miles) apart if optical fiber is used as the physical medium. Optical fiber is not required for shorter distances, however, because the Channel also works using coaxial cable.


NFS


The Network File System (NFS) is a distributed file system protocol originally developed by Sun Microsystems in 1984, allowing a user on a client computer to access files over a network in a manner similar to how local storage is accessed. On the contrary, CIFS is its Windows-based counterpart used in file sharing.

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user_135
Created Sep 30, 2014 09:15:56

Thanks for sharing!
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PanchakS
PanchakS Created Mar 8, 2022 06:45:11 (0) (0)
 
songminwang
Created Aug 6, 2019 12:20:21

Very useful
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PanchakS
PanchakS Created Mar 8, 2022 06:45:29 (0) (0)
 
olive.zhao
Admin Created Dec 30, 2019 12:12:43

Differences between SCSI, ISCSI, FCP, FCoE, FCIP, NFS, CIFS, DAS, NAS and SAN-3186508-1
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user_4397771
user_4397771 Created Mar 8, 2022 06:46:07 (0) (0)
 
little_fish
Admin Created Sep 30, 2020 12:30:09

so cool post.
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user_4397771
user_4397771 Created Mar 8, 2022 06:46:13 (0) (0)
 
stephen.xu
Admin Created Oct 19, 2020 09:33:04

Good post
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user_4495775
user_4495775 Created Mar 8, 2022 06:46:44 (0) (0)
 
user_4396693
Created Oct 11, 2021 11:16:02

Good
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user_4495775
user_4495775 Created Mar 8, 2022 06:46:50 (0) (0)
 

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