15-30ms latency seems reasonable for that hardware (P420 in RAID 10 with 4x4TB 7k SAS HDDs.)
Basically your single SAS disk can do ~150IOPS random, so worst case of 4k random reads you will get ~600KBps.
For the migration if it's sequential (depending on filesystem layout), the performance can be different, up to maximum streaming performance of like 100MBs for large sequential reads.
Then 2x for your RAID config.
I think what you want to do is go into your db vm and run a DD or fio or bonnie++ that is at least 2 x the VM RAM, and see what the steady-state disk performance is.