Let me tell you about the last time I used RAID-5 in 4 disk array:
When one of my disks died a sudden death, I swiftly popped in a new one and kicked off the resync process, which took about 48 hours to complete.
14 minutes(!) after the resync finished a second disk died.
Lesson 1: RAID-5 is pretty useless. When a disk dies you have no more redundancy during the extremely stressful RAID recovery.
Lesson 2: RAID is not an alternative to backups.
@fribbledom I agree, sir.
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