iSCSI autofailover is awesome--what are its limitations?

[webguyz]

Also was curious if the 2 DSS servers doing autofailover have to be EXACTLY the same? We are trying to use a 3ware 9690 (with 512 cache) we already have for our secondary DSS and our Primary DSS has an Areca 1680i (with 2 gig cache). Would be great if we could reuse some old hardware and save some bucks. I'm thinking if they are cofigured the same at the volume level they should be OK? Any thoughts otherwise?

Thanks!

[To-M]

The secondary system does not have to be the same (CPU, RAM, RAID controller...) but should have good performance values similar to the primary.