can i add additional VMDK to the vm which is already protected with vSphere replication 5.1?

Hi,

  We are uaing SRM 5.1 to protect a VM using vSphere replication. now we want to increas the size of one of the vmdk dirve. can we increase the drive size? and if we can not then, can we add another VMDK to that VM?

what is the procedure to protect that additional newly added VMDK?

Thanks