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Exchange Server in hung state, mail still working, 1 scsi hard drive has no status lights.

Our exchange 2003 server which is running off of Windows Server 2003 is having a problem.  First I noticed I could not remote desktop to the server.  I can send/receive mail, browse network shares, remotely view the event log, which is showing this under system
Physical Drive on DEVICE ID 3 on Port 1 of
Array Controller  in slot 2 has failed.
Failure Code: 0x14.

So the third hard drive does not have any led lights on it, they are all blank.  The server has six hard drives in it.  I am not familiar with what level raid is in use.  A old belarc scan shows the following
HP LOGICAL VOLUME SCSI Disk Device (36.41 GB) -- drive 0
HP LOGICAL VOLUME SCSI Disk Device (145.67 GB) -- drive 1

I dispatched our PC tech who tried to login at the console, it took the server over 30 minutes to get to the desktop.  He then attempted to reboot and the server has been hung at the logging off screen for two days.  

I do not want to loose any data.  I have a replacement hard drive.  Should I just replace drive number 3, they are hot swappable.  However the server is also in the logging off state, however mail continues to flow which is nice.  How can I determine the raid level?  Can you guys please help me rescue this server!
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A hard shut down will not hurt your server, first ensure your users are aware that the mail services will be going off line temporarily. Power up the server and go into the configuration manager (should be a combination of CTRL and a "letter" on the keyboard. Pay attention to the boot sequence  so you will see which "letter" to push. Inside here you should be able to see what the RAID configuration is and possibly rebuild it if the option is available.
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Thank you both for your comments.  I guess I will stop being a scaredy cat and reboot the server.  I am thinking its a raid 1+5 array.  Thats two mirrored drives and then a striped volume?  Should I perhaps put a fresh drive in place of the failed one before I reboot?  Thanks again guys, points to be awarded soon.
I would try to rebuild the RAID configuration first and then if one of the drives is still faulty then I would replace it.
I would remove the dead hard drive and install the new hard drive in a separate slot with a different SCSI ID.  Then, you can probably choose to add it as a hot spare and allow the array to be rebuilt before you try to boot up to the OS.

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

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