The appliance uses the disk drive that is located in slot 11 as a hot-spare disk.
If one of the disk drives fails in slots 4 through 10, the appliance automatically initiates a RAID 6 rebuild operation. It rebuilds the RAID 6 array by using the hot-spare disk drive in slot 11.
After you replace the failed disk drive, the appliance then copies the information from the disk drive in slot 11 to the new replacement disk.
When the copy operation finishes, the disk drive in slot 11 again becomes the hot-spare disk.
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