Acer Altos R5250 - Manual (Page 119)

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To initialize the Onboard SATA RAID Configuration Utility:
Note: There must be at least one SATA hard drive installed in the
system, otherwise the MediaShield ROM BIOS 6.77 will not appear
during POST.
1 Turn on the server and the monitor.
2 During POST, press F10 on the MediaShield ROM BIOS 6.77
Manager option ROM prompt.
To create a RAID 5 volume:
1 On the Onboard SATA RAID Configuration Utility, use the Up and
Down arrow keys to select RAID 5 for the RAID Mode.
2 Use the Left and Right arrow keys to change the setting of the
HDD from Free Disks to Array Disks.
3 Press F7 to start creating the new RAID 5 volume.
4 Press Y to clear data on the disk.
Once the new RAID volume is created, volume will display on the
screen.
5 Press Ctrl-X to close the utility.
Proceed to the installation of the operating system. Refer to the
user documentation that came with your OS for related
instructions.
To assign a hot spare disk:
You can skip this procedure. If you have an HDD that is not configured
and is marked as free, the HDD will be rendered as a hot spare disk.
When an HDD fails, the HDD that is marked as free will be used to
rebuild a RAID automatically.