Asus SCSI 320-2 - Manual (Page 25)

LSI MegaRAID Userʼs Manual
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7. Select Array 1 and set the RAID Level as RAID5 and Span as Enabled.
Then input the RAID 5 size value with spanning in the circled area into
the Select Size box. Click Accept to continue.
8. You could now view all the RAID setup information in the Configuration
Preview window. The two arrays then form a RAID 50, with the Array
2 being the continuance of RAID 1.