Storage Assignment failed (Invalid host name or IP address, DNS lookup failed)

This error message occurs when you’re using XenServer 5.x with Storage link gateway. The host & SAN communication is good but somehow storage link management server is unable to resolve the name of destination host (Host where you want to start VM)

To troubleshoot this issue, make sure that hostname in Storage link server and the hostname in XenServer CLI is same and it is not called hostname or localhost.