 Re: regarding Designing SAN
On Aug 25, 8:13*pm, Ed Wilts wrote:
> 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:ewi...@ewilts.org
ok , beside keeping two remote location in sync ! what are the
advantages of striping of data blocks as implemented in RAID
controllers in remote locations ? what are the pros and cons of this
solution??
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