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NAS with iSCSI in comparision with iSCSI SAN

Hi @ all

Years ago the main advantage to use a SAN instead of a NAS was that in a SAN environment the OS could manage the Filesystem on his LUN and you could write and change files on block level, in comparision of NAS you couldn't right?

But since all new business NAS now can communicate over iSCSI, you can direct attach a LUN on a NAS aswell to let the OS manage the filesystem and write on block level, right?

Now, what ar the advantages of a iSCSI SAN in comparision of an iSCSI enabled NAS?

Thanks for your help
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ECOteam
Asked:
ECOteam
1 Solution
 
andyalderSaggar makers bottom knockerCommented:
It's generally a difference in redundancy levels, a cheap NAS with iSCSI may be a single point of failure althoug hit may be possible to cluster two of them for high availability. A hardware iSCSI based SAN is more likely to have two independant controllers and address redundancy that way. That is a bit of a generality though, NetApp filers for example provide redundancy through dual controllers and they're NAS/SAN hybrids, and single controller variants of hardware targets are generally available.

As to performance it's really down to the number of spindles, SSDs, cache etc so it's not possible to say one is faster than the other generically.
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