Storage :DAS , NAS and SAN

Data is the soul of any organisation.If the soul gets bruised or tarnished then the whole body gets affected likewise if data gets compromised then the organisation is at risk.So it matters a lot how you store your data.Data are the most vulnerable asset in this 21st century.So companies reputation and revenues are now more dependent like never before ,  the way it stores its data

DAS: The name says that the storage is directly attached to the server.

So lets say , If I have four servers , then I have four sets of storage attached individually
to each of this server. Lets say if one server is down then data resided in that particularly
attached storage can not be transferred.

But as it has less intial cost setup and the business which is running in a localised environment,
can go for this form of storage.


NAS : Here storage  is directly attached to the network which is fully capable enough to serve files
over network where as in case  of DAS where Server has to play dual role of file sharing and
provide services.


SAN: It's a high performance storage network that transfers data between server and storage devices.
Here the storage devices is separate from local area network.As the degree of sophistication
and cost is more , so it been used in mission critical application.

Here the bunch of networked storage is connected to the server over fibre channel.The inherent
property of fibre channel is fast.

I will discuss in a future post about Fibre channel and SCSI.