Purchased the remaining 5 4TB hdd today. Shall fix it up tomorrow. Probably will do the testing on weekend.
I decided to go for RAID 6 set up, so total usable storage is 66%, 16TB. My rational for choosing RAID 6 is I have 2 disk for safety. No matter which 2 disk fail, my data remains intact. But if more then 2 spoil, all is lost. As for two RAID 5, even if 3 disk fail, half the data remains intact, but there is a chance that 2 disk fail in the same pool will lose 50% of the data.
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