Are database copies really the only HA option for Exchange 2010?

I've been researching transitioning from a clustered Exchange 2003 environment to a similar 2010 environment but, from what I can tell, I have to double my storage to do this? Is that right, or am I just reading it wrong? Because, I have to be honest, it seems a little ridiculous.
kck7Asked:
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Glen KnightCommented:
DAG's are the only database HA option in Exchange 2010, and yes, you would need double the storage.
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kck7Author Commented:
I had a feeling that was going to be the answer. I still think it's ridiculous. Thanks.
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