SRDFData replication from one DMX Symmetrix storage array to another through a Storage Area Network or IP network.


Cloning – Create full-volume copies of production data and it allow you to run simultaneous tasks in parallel on DMX Symmetrix arrays even in real time.


In short, SRDF (Symmetrix Remote Data Facility) is remote, where cloning is local.


On a EMC Symmetrix, you can clone a volume, which involves taking a track wise copy from one LUN (Logical Unit Number) to another. Whilst the clone is 'established' it's being copied and kept up to date. This significantly increases efficiency and productivity when come to maintenance / schedule downtime activities for the production needs of the Enterprise.



When it's split it becomes Read/Write to the Operating System (OS), and starts going out of date, but does give you a point in time copy for whatever reason. The difference between a clone and a snap is that a clone is a full copy, where a snapshot is dependent on the source disk (but tends to be smaller/faster to create as a result).



SRDF lets you replicate from one array to another, and maintain the relationship. We use it for Disaster Recovery (DR) - our “Primary'” production data centre replicates all it's storage to another DMX Symmetrix array in another/ secondary (DR) Data Center. Mechanisms are similar, but there are more limitations and overheads, since you have to use an external communication link of some kind.