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Convert RAID 0 to RAID 1

Greetings,

We have a Dell R415 Windows 2008R2 Server in our Enterprise Environment that is running on RAID 0. The Server has a total of 4 drive bays which are all occupied and included in the RAID 0 Array.
The RAID Controller is a Perc 6/iR and according to Dell Support it will only handle RAID1 or RAID 0 - unfortunatley the latter was chosen by the previous IT Manager.
Current configuration = RAID 0 utilizing 4 drives at 278GB each with 160GB's of data currently on the Virtual Drive between 2 partions (2 partitions = OS & Data).

The Server is running 4 critial Systems (Hyper-v) and I would like to convert the current  RAID 0 Configuration to a RAID 1 w/hot spare.

I am looking for suggestions as to the best method to accomplish this reconfiguration.
The maximum amount of downtime I will be allowed to have is 12 hours before the Server needs to be put back into production. I believe the USB ports are 2.0.

I would like to avoid purchasing new hard drives but if it's necessay it can be done.
I do have Dell's openmanage currently installed on the server.

Thank you.
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Sajid Shaik M
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The answer is the same answer you would have if this wasn't a RAID controller and you wanted to change from a 250GB HDD to a 500GB HDD.

Do a full backup.   Replace the HDD(s).  Restore.

Only difference is that when you replace the HDDs, you tell the RAID controller to build you a RAID1.
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in retrospect, I should have written replace 500GB with 250GB disk. -- But that is what happens when you are doing taxes at 4:30 AM and decide to take a needed diversion with EE .. not my best work ;)
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Thanks to all of you for your help and expert advice.
Installed 3rd Party program (Macrium Reflect Server Ed.).
Created Clone and Image to separate destinations (for safety)
Backed up all data separatley (for safety)
Rebooted Server.
Deleted current RAID 0 Set
Created new RAID 1 Set.
Rebooted to Macrium Reflect boot disk and restored image to new RAID 1 Virtual Disk.
Created  Hot spare.
The Server is up and running utilizing RAID 1