RDM cluster storage vmotion

[vmwARE-NEW]

We have vsphere 5.5 and we are having windows 2008 and 2012 file and SQL clusters using attached RDM disks.. We are in the process of migrating data from one storage to another storage. In the backend we migrated all rdms disks to the new storage without outage and We are planning to migrate the operating system vmfs volume from old storage to new storage using storage vmotion.

Can you tell which one is best way to do this without the downtime?

[dhanarajramesh]

with out downtime it's not possible, you required guest OS downtime . so the better way of migration is 1) create new data store using new storage LUN and power off guest VM and perform storage vmotion from old storage data store to new storage data store. 2) once it's done, power on and check the OS , old RDM LUN connectivity and services 3) after that make availability of new storage RDM LUNs to the clusters( which is the copy of old storage RDM ) 4) shutdown the guest and remove old RDM from guest and add new RDM in the same sequences 5) power on the guest and verify the data