On Aug 25, 7:19*am, 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 ?
This only makes the SAN more efficient if you're only doing reads. If
you're doing a lot of writes, this makes the SAN very inefficient
since you're doing synchronous replication between 2 locations. If
they're under 100km apart and you have really low latency, you can
certainly do this. If you're trying to do this between NYC and Kansas
City, your performance is going to suck. In any case, you will
*always* slow down writes in a synchronous replication solution. You
can not write any faster than your network.
You need to determine if you're trying to build a DR solution or a
high-performance solution - they have different trade-offs.
.../Ed
Ed Wilts, RHCE, BCFP, BCSD, SCSP, SCSE
mailto:ewilts@ewilts.org