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RAID 5: 1 drive is rebuilding and 1 not in the array

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Last Modified: 2016-12-08
I came in this morning and my server is down.  Boot it up and I get a hard drive failure.  So I go into the adaptec manager and Drive 1 is up, Drive 2 is rebuilding, Drive 3 isnt anything - its just greyed out, but it used to be part of the array, and drive 4 is a Hot Spare. The RAID 5 array has a yellow exclmation point and a status of critical.   Once this rebuild finishes will this server come back up?  If not is there anything I can do to recover this server.  

The controller posts RAID 5 failed.  I went into the configuration (ctl-A) and verified drives 2 and 3 and they both finished successfully.  If I do wait on the rebuild - how long can I expect to wait? If the rebuild doesnt work is there ANYTHING I can do?
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