troubleshooting Question

RAID 5 with Three Hard Drives - Rebuild or Not Rebuild?  HELP!

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benc007Flag for United States of America asked on
DellRAIDStorage HardwareStorage
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I have RAID 5 with Three Hard Drives.  This is a Dell PowerEdge 1750 with PERC 4/DI.

One of the drives is failing on an important server.   In RAID I see:

Array Disk 0:0   Failed    SCSI    ProductID   Rev0003   Seagate   136.63 GB capacity
Array Disk 0:1   Online    SCSI    ProductID   Rev0003   Seagate   136.63 GB capacity
Array Disk 0:2   Online    SCSI    ProductID   Rev0003   Seagate   136.63 GB capacity

I am not sure why the disk failed, but in Windows Server 2000 I see http://prntscr.com/evbuv6

Questions:
1) Should I rebuild the one failed drive, and then put it online?  
2) Or should I buy a new hard drive and hot swap it?
3) What's the worse that can happen?
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