(1) You are booting off a san disk. And you have problems with the san driver, what ya gonna do?
A: of course, you need to change the module (a trivial answer); in linux, you need to find a way to load that new module before mounting / partition. This means, creating initrd image, which gets mounted in memory--be it initrd (ramdisk file system--block device exe2 driver) or initramfs (no need for caching, tmpfs driver). Note the chicken-egg problem in the boot process: ext2/tmpfs kernel modules are part of kernel.
use mkinitrd to create the image.
(2) Can subnet A's gateway IP be part of subnet B?
Yes; in fact, look at the gateway of your cable connection. This is done using proxy-arp.
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