varun wrote:
> to increase the efficiency of SAN . I am thinking of a design which
> provides an in band virtualization which recieves data requst n form
> of ISCSI packets. splits th requst into two . and simultanously maks
> connection with two physical disk remotely placed in different
> locations in sync with each other. is this thing possible !! if not
> why not ?


Not only possible, but quite widely implemented in a variety of storage
virtualization implementations. The only real gotcha with doing this
synchronously is distance of the two locations which will impact
latency, potentially up to the point that the host will think the I/O
timed out and force a retry, or worse.

--
Nik Simpson