i have installed 12 hard drives 4 TB Black Caviar make raid 5 and suddenly failed two drives at same time can rebuild raid if i replace failed drives with new drives. my data is still available or not data is very important.
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4*sigh* - we get someone just like you every couple of weeks - still using R5 in 2018, worse still in your case with large SATA disks and large disk sets - R5 has been effectively dead for a decade or more - your data is lost, restore from backup and learn from this lesson. – Chopper3 Jun 28 '18 at 10:47
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It's OK to use RAID5 with SSDs but you can't do RAID5 with HDDs >1TBs. Reason is simple: Slow rebuilds and very high chance of a double fault single parity RAID can't survive.
BaronSamedi1958
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