Can RAID 5 survive multiple disk failures?
If a second disk in a RAID 5 disk array fails, the array also fails and its data is not accessible. If a second disk in a RAID level 5 disk array fails, you must replace the failed disks, then delete and recreate the disk array.
What to do when a RAID drive fails?
RAID5 is easy to work with, especially since you know exactly what disk is dead. All you need to do is power down the array, replace the dead drive, then power the array back on. The parity info spread across the drives will start re-creating the data on the new disk.
How do I replace a failed drive in RAID 5?
The downside to RAID 5 is that it can only withstand one disk drive failure. Thankfully, RAID 5 is hot-swappable, meaning one disk drive can be replaced while the others in the array remain fully functional.
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