Asus SCSI 320-2 - Manual (Page 31)

LSI MegaRAID Userʼs Manual
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7. You could now see information of all RAID settings. When you have
finished the setting for Array 1 and Array 2, please click Next to
continue.
8. Set Array 1 as RAID 1, and set the Span as Enable. Input the Select
Size box with the RAID 1 size value within the circled area; then click
Accept and Next to apply.
9. You could then see the information of RAID settings in the Configuration
Preview window. The two arrays form a RAID 10, with the Array 2 being
the continuance of the Array 1.
10. Click Yes to save the settings, or to click No to cancel the configuration.