RAID-1 drive failure - will the missing data be "rebuilt"?

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http://serverfault.com – We are a small company with an old Dell PowerEdge 830 with a CERC 6ch raid controller. Server is our file server, domain controller (Windows Server 2003), MySQL server, etc. We have a sysadmin that we have worked with for a couple years that usually keeps things working well for us, but he's out of the country and unreachable right now. Yesterday I received a call from my manager that the server had an alarm sound going off, quite loud and would not stop. No one at the office complained of errors saving files to the server or reading files. I came into the office and did some googling and (HowTos)