Making a backup DC a global catalog server to serve logins

I have two domain controllers here. One was installed as "an addition domain controller". Just to provide redundancy.  My question is: How do I make this additional domain controller a global catalog server?  I want to be able to use this additional domain controller in case the PDC goes down.

So far, my plan hasnt worked. I powered the PDC down and left the backup DC on. I turned on one of my clients and tried to login. It said "cannot find domain spira.com"

Thanks
dissolvedAsked:
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dissolvedAuthor Commented:
Yep, thats exactly what I did already. However, it appears as if you can only have one Global Catalog Server per domain.  Maybe that's my problem?

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dissolvedAuthor Commented:
Found out you have to wait like 30 minutes for it to replicate. ...

thanks for link
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