Looks like the reason that the system wasn't booting was the SAN. I disconnected the SAN from the node and it booted fine, I then connected the SAN back and I started to get the following error scrolling:
blk_update_request: I/O error, dev sdd, sector 0 op 0x0: (READ) flags 0x0 phys_seg <Random Number> prio class 0
blk_update_request: I/O error, dev sdd, sector 0 op 0x0: (READ) flags 0x0 phys_seg <Random Number> prio class 0