Asus SCSI 320-2 - Manual (Page 13)

LSI MegaRAID Userʼs Manual
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7. For RAID 1 configuration, set the RAID Level as RAID 1, and input
the RAID 1 size value within the circled area into the Select Size box
(For example: RAID 1 size= 35002 MB). Then click Accept and Next
to continue.
8. The Logical Drives window now displays the status of the configured
RAID, Click on Accept to continue.