RAID Rebuild very long time / freeze?

We have a Mac Server with the following setup.
SATA 500G HDD x 1 (for Mac OS X 10.6.8)
SATA 2TB HDD x 2  (Raid Mirror)
I found one of the 2TB hdd was shown failed but it didn't show errow when I clicked it individually. So just thought it might be the writing error on RAID.
So I clicked Rebuild and then it showed message "Adding booter for RAID partition disk1s2" and the status bar indicates that it is running till around 40%. After 2 days, it is still running around 40% with the same message.
It's adnormal. What should I do now? stop it or the HDD is really failed? Many thanks.

I turn off the Server lastly and resart. It's back to original state the says one HDD failed.

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