SAN storage

 
unixengg
Occasional Contributor

SAN storage

Can somebody explain me the concept of SAN and NAS and diffrence between them ?
2 REPLIES 2
Johan Guldmyr
Honored Contributor

Re: SAN storage

http://en.wikipedia.org/wiki/Network-attached_storage

http://en.wikipedia.org/wiki/Storage_area_network

NAS is seen from the clients as a file server, they access it over the network, via a network protocol like NFS and CIFS.
On a SAN you can provide disks or tape to servers - sending SCSI commands over the SAN.

In the NAS article in wikipedia there is a NAS vs SAN section.
Bart_Heungens
Honored Contributor

Re: SAN storage

Fairly simple:

NAS is file based access to storage, SAN is block based access to storage.

So, with NAS the box itself will put a FileSystem on the disks and you can directly write files to it, with SAN you (your server) has to put a FileSystem on the disks...

And so the protocols used are different, CIFS/NFS/SMB versus SCSI/SAS/SATA
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