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RAID 10 Configuration

Last Modified: 2016-12-08
I had qty. 10 brand new SAS 600GB HDs and was setting them up in RAID 10 on INTEL RS3DC080 RAID CONTROLLER in BIOS.
After selecting RAID 10 and Span:  2 in Virtual Drive Configuration screen, I was on my way to select hard drives to be included in the raid 10.
Each time I press space bar (on the keyboard)  on first 8 hard drives (0 thru 7), it left "X" in the check box in "BLACK" color.
When I selected 8th and 9th (which is 9 and 10th physical hard drive), it left "X" mark in "WHITE" color instead of "BLACK" color. Although it generated correct total space for the raid (600GB x 5), I found it strange.
Upon further examination, (although I don't recall exact column title on this configuration screen), each hard drive was labeled "0" thru "9" and under span column(?), each HD showed either 1 & 2 (or 0 & 1) in sequence. So hard drive "0" had 1 in span column and hard drive "1" had 2 in span column.  Hard drive "2" had 1 in span column and hard drive "3" had 2 in span column.
      HD#   Span
[X]   0         1
[X]   1         2
[X]   2         1
[X]   3         2
[X]   4         1
[X]   5         2
[X]   6         1
[X]   7         2
[X]   8         2  * X in white color
[X]   9         1  *  X in white color

However  hard drive "8" had 2 in span column and hard drive "9" had 1 in span column. Why would last two HDs be out of "Sync"? and perhaps that was the reason why it left "White colored X" mark in the check box?
What does this mean and what causes this? These SAS hard drives are brand new and just put in to hot-swap bay on the brand new rack server.
I will take pictures of RAID configuration page later on today and post it.
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