Some Dataguard is good, lots more must be better?

I know some of you folks have large SMPs as the result of consolidating from
a lot of little SMPs into one large one for managability sake. What about distaster
recovery? If you have, say, 20 databases in a large SMP, do you set up 20 "streams" of
DG to a DR site? Is that a nightmare? Are there any sites out there that have, say, more
than 10 databases that require disaster protection where DG is the tool of choice? Or
do such sites opt to replicate at the storage (or volume e.g., Veritas VVR) level?

Yes, Carel-Jan will remind us that replicating at the storage level requires replication of
all writes as opposed to just sending redo pieces...

Thoughts ?

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