Network Attached Storage (NAS) - Enterprise

Difference between SAN and NAS

 
Ajayan P.K
Occasional Contributor

Difference between SAN and NAS

What is the difference between SAN and NAS?
can we use NAS for windows server clustering?
3 REPLIES 3
raadek
Honored Contributor

Re: Difference between SAN and NAS

NAS = Network Attached Storage, i.e. storage from the server perspective is seen as a remote network resource (drive). Hence data is sent/received on a file-level, i.e. either an entire file or nothing (that's true especially in Win environment).

NAS cannot be used for windows clustering.

SAN = Storage Area Network, utilising mainly fibre channel connectivity (& iSCSI over LAN recently). In this case storage is seen as a local resource, hence block-level data access is possible.

SAN can be used for windows clustering - this applies both to FC & IP (iSCSI) SAN. However for a simple environment (e.g. only one cluster) you may consider directly attached shared storage - HP MSA500 G2 (also available as a pre-packaged cluster with a couple of DL380 servers)

Rgds
Don't panic! [THGTTG]
avik
Valued Contributor

Re: Difference between SAN and NAS

NAS can be used as a shared storage for setting up clusters. You could either use iscsi or fcp to get a block access of NAS, (atleast netapp supports this)
Uwe Zessin
Honored Contributor

Re: Difference between SAN and NAS

> get a block access of NAS

No. NAS, by definition, is "file sharing" over a network infrastructure.

The NetApp boxes (and some other vendor's as well) can do both, NAS and SAN at the same time.
.