Thanks for the reply.
It sounds like the 'resignature' option is the one I would use because I would expect to get SAN 1 back by 'hook or crook', I just need to test this out somehow.
I am going to implement HA clustering soon, so that will atleast power on my machines after a power cut and subsequent restart of the boxes. One other question though, should I start my SAN or the hosts first? I've had all of my VM's with an alert since our powercut 
By the way, just reading your book, clustering deep five v5.0 in prep for the exam. Didn't realise 5.1 was out 