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NAS vs SAN

Hi,

I saw NAS (Network-Attached Storage) and SAN (Storage Area Network).

Question:  Why do they have both (NAS & SAN)?

tjie
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tjie
Asked:
tjie
3 Solutions
 
Shaun VermaakTechnical Specialist/DeveloperCommented:
SAN vs NAS
Storage area networks (SANs) and network attached storage (NAS) both provide networked storage solutions. A NAS is a single storage device that operates on data files, while a SAN is a local network of multiple devices.
https://www.lifewire.com/san-vs-nas-818005
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Sajid Shaik MSr. System AdminCommented:
the major difference in both are block level and file level..

sannas.png
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Seth SimmonsSr. Systems AdministratorCommented:
they perform 2 different functions

a SAN has storage you directly attach to a system (over fibre channel or iSCSI) as if it was a local drive
if you had a 5tb SAN, you could create a 1tb LUN and attach to a VMware ESX server which appears to the server as a local data store that you can use for virtual machines, for example

a NAS is more for file sharing.  you can create a LUN and that that can be available over different protocols such as CIFS (for windows clients as a network file share) or NFS (for linux, VMware hosts)

there are some vendors like Pure that are just SAN and present storage to hosts or NetAPP that can do both having SAN volumes for hosts and NAS file shares for clients (and of course many other vendors in this space)
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