Upgrading single SCSI drives to RAID 5

I have a question regarding the upgrade of a single disk SCSI drive to a RAID 5 array.  I have a Dell Poweredge 2550 server that has two SCSI drives running separately, without any sort of RAID array.  I was wondering if it is possible to add two more SCSI drives to this server along with a DELL PERC4 controller and create an array that uses the original two disks while keeping their valuable data intact as well as being bootable?  Any Ideas?

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Hi.  The software should provide a RAID migration utility to preserve the data while migrating the current drive to a RAID array.
Move the data from the second drive to the new RAID drives.  Then, use the Dell controller software to migrate the OS into a RAID array.

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Although you can do that as gpriceeee has said, this is a potentialy dangerous action, and it is absolutely necessary that you have a good, tested backup before you start of doing that. Anything can happen in the process, and then you have lost your data. Any manipulation with partitions and disks etc require a good backup.
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