Array cli guide has the information that you are looking for. You will need to run the deletepair on the SRDF devices to make the std metas and then expand using protect option (2-way BCVs) on both R1 and r2 and do a createpair again.  regards, saurabh rohilla
Is there a best practices document available that describes the steps for expanding a striped meta that is also replicated via SRDF/A?  If there is not a document, what are some opinions of the best method to use?  The source volume will have to use the mirrored BCV to expand non-disruptively.  The system I am using is a DMX-4 running 73 code.
Expanding Striped Metas that are replicated via SRDF/A