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Slow drive/array rebuild with LSI MegaRAID 9240-8i

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(sorry, I was trying to perform a search first before posting, but I couldn't find where the search button was)


So I have server which has the following RAID5 configuration

8x HGST 6 TB 7200rpm SATA 6 Gbps drives

LSI MegaRAID 9240-8i (and it's already using the latest firmware)


I'm trying to replace the array one drive at a time from 6 TB drives to 10 TB drives (HGST He10 10 TB 7200rpm SATA 6 Gbps), and it's saying that the estimate time to rebuild an array that has no data on it is about 105 hours(!).


The rebuild rate on the controller is already set to 100.


Why it is so slow?


Short of deleting the virtual drive configuration, switching all of the drives in the array from the 6 TB drives to the 10 TB drives, and then creating a new virtual drive; is there anything else that I can do to speed up the rebuild process?


Thank you.

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