Replication over 1 GB for remote data center links

I Compellent LUN in a city and you want to replicate to a Compellent storage array in another city. We only link to 1 GB and 500 GB of data to be replicated. I guess an asynchronous replication would be necessary, but you should know how it will affect the traffic production on this link when replication is drawn. These off-peak hours do?

You can use QOS on the HDS to mitigate network contention.  When configure you QOS, you choose your connection speed, and then if you enable the throttling you can choose up to time what percentage of replication of this link can be used.  It will use as much as you give so you should have an idea how much data 'regular' traffic consumes on the link and throttle below only if you want to make sure that you will not influence the movement of the production. BUT you should know that you can actually finish the repetitions in a reasonable amount of time. If this isn't the case, then you need to increase bandwidth or watch using a bandwidth optimizer that will compress/data deduplication until he goes on the wire.

The choice between Async/Sync is a bandwidth issue, but especially Sync requires low latency, since the acknowledgement of receipt must be made prior to the remote SAN then before local SAN it goes back to the server.

Tags: Dell Products

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