Howdy,
If you are a user of the IBM San Volume Controller and/or the Storwize you should really checkout this announcement.
What I found most interesting was HyperSwap – now you can present a single volume from two different storage controllers which use metro mirror for a two way replication (although I do not have any more details on this). This is something like the Active-Active function in EMC’s Metro VPLEX installations. Cool stuff!
Bgrds,
FOG