I'm planning to implement MDS9124 in our SAN. Right now we need only local SAN inside one building. But there is a slight chance that in a future we'll need to connect to a remote site using FC ptorocol. The site is not too far away - 20 km or so. But Cisco offers only 10 km LW SFPs for MDS series switches.
I'm aware that there are LW SFPs for Ethernet equipment which allow to connect to sites up to 80 kilometers away. Are there similar options for MDS series? Or how that problem can be solved? FCIP or iSCSI is not an option.
Additional question: do I need to buy some software or licenses to use long range connectivity option? Less that 10 km? More that 10 km?