Acer Altos R5250 - Manual (Page 121)

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10 Press C, then select Save changes then exit this menu.
Proceed to the installation of the operating system. Refer to the
user documentation that came with your OS for related
instructions.
To initialize a RAID 1 volume
You can skip this procedure if you selected to create a new IM array
(or pressed D) while performing the creating a RAID 1 volume with
a hot spare disk section. After you create a new IM array, no
synchronization will be performed. You can exit the SAS configuration
utility and proceed to install the OS.