Tried many things (reboot, reinstall, new configurations...) but snapdrive was always very slow but there were no error messages on the host. Then while troubleshooting, looked at the network, BINGO!
The remote server was configured with HP network team with type "Transmit Load Balancing with Fault Tolerance (TLB)" and the host server and SAN management port where both on the same IP subnet. This is a known issue with RSH traffic.
Changed the HP teaming on the verification server to "Network Fault Tolerance Only (NFT)" and snapdrive started working as normal. Restarted the SMSQL service on the production system and verification now running on the 2nd site.