What is the best RAID level for (4) 3 TB drives? Punctured array?

noobtastic88

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Jun 23, 2015
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Hello all, I am very, very new to the storage realm.

I need to set up a RAID array for someone who has (4) 3 TB drives. I recently replaced a drive in the array and now it is coming up with punctured array errors and double fault errors. Based on the documentation I have read so far, I think I need to blow away the array at the controller level and restore the data from backup.

While I have the opportunity to do so, I am wondering if I should go with a different RAID level while I re-initialize the array and start from scratch. I always hear things about RAID 5 being terrible but I am not sure why people say that. Is there a better solution I should be going with in your opinion or experience? Why or why not?

Also, what causes a punctured array or double faults? Is there a way to prevent this in the future?

Thank you, responses are greatly appreciated.

Increased performance is a big consideration. This user will be storing a lot of big data files so read/write performance is high up on the list. Daily backups are taken.
 

utgotye

Admirable
Depends on how much storage they want/need. It also depends on the importance on the data as well as if increased performance is wanted or not. All that being said, with that set up, the best compromise amongst all of the aforementioned dependencies is RAID 10. Gets you 6TB of space, the safety of RAID 1 and some of the performance of RAID 0.
 
What is your objective in using raid?

The value of raid-1 and it's variants like raid-5 is that you can recover from a drive failure quickly. It is for servers that can not tolerate any interruption.
Modern hard drives have a advertised mean time to failure on the order of 500,000+ hours. That is something like 50 years. SSD's are similar.
With raid-1 you are protecting yourself from specifically a hard drive failure. Not from other failures such as viruses, operator error,
malware,raid controller failure fire, theft, etc.
For that, you need external backup. If you have external backup, and can tolerate some recovery time, you do not need raid-1
 

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