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#1
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regarding Designing SAN
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 ? |
#2
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regarding Designing SAN
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 |
#3
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regarding Designing SAN
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 |
#4
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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 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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