I could not find a definitive answer as to whether the HP storage blade (the only one I know of) provides twin tailing for SAS. As it is, one way I know you will be able to get access to the disks is to mount your file system on them and share that with the other server. This will only work for “file friendly” apps such as Oracle and VMWare. If you want to run exchange or something, you will need to direct connect your server to the blade.
Also, I heard of a new SAS switch in the market- I don’t know who makes it or whether it’s supported with your system, but you could ask your blade vendor.