Dell PowerEdge C6220 - About Your System; Accessing System Features During Startup

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Dell PowerEdge C6220 and CentOS 6.2: A LAMP Reference
Architecture
19. At the Partition selection screen, select Replace Existing Linux System(s),
and click Next.
20. If a warning appears, click Write changes to disk.
21. At the default installation screen, Select Minimal and click Next to begin the
installation.
22. At the Congratulations screen, click Reboot.
23. After the system reboots, open a console window and login in as root.