[SOLVED] [RAID] THREE disk fault tolerance

[supaj.enchill]

Is there any raiding level that allows up to three disks fault tolerance? Where I could have up to three disks failing and the system would still run?

 

[USAFRet]

Is there any raiding level that allows up to three disks fault tolerance? Where I could have up to three disks failing and the system would still run?

Sure. A RAID 1 array, with 4 or more physical drives.
Of course, that is a monumental waste of drive space, for a "problem" that is more easily handled in other ways.

What are you actually looking to accomplish?

 

[supaj.enchill]

Is there any raiding level that allows up to three disks fault tolerance? Where I could have up to three disks failing and the system would still run?

Sure. A RAID 1 array, with 4 or more physical drives.
Of course, that is a monumental waste of drive space, for a "problem" that is more easily handled in other ways.

What are you actually looking to accomplish?

I most definitely do not want the RAID 1 solution. I'd like something similar to RAID 6 only this time up to 3 disks would have fail.

 

[USAFRet]

Is there any raiding level that allows up to three disks fault tolerance? Where I could have up to three disks failing and the system would still run?

Sure. A RAID 1 array, with 4 or more physical drives.
Of course, that is a monumental waste of drive space, for a "problem" that is more easily handled in other ways.

What are you actually looking to accomplish?

I most definitely do not want the RAID 1 solution. I'd like something similar to RAID 6 only this time up to 3 disks would have fail.

I am not aware of anything that will do that.
I suppose you could create some overly complex combination of RAID 5 or 6, and RAID 1. Which would survive fail of "some" of the drives, but not a random "3 drives".

What actual problem are you trying to solve?

 

[RealBeast]

Best already advice given: first define your problem and then seek your solution, so "what problem are you trying to solve?"

IMO it makes no sense to go past RAID 6, the chances are that you will have a catastrophic device failure (fire, flood, etc.) that will negate the value.

Better to use RAID 6 and backup the array (which should *always* be done if the data has any value and is not easily recreated) to several other arrays including offsite, one of which is offline and powered down most of the time.

For those who wish they could have RAID 7, learn to use FreeNAS and zfs3 -- I think it is silly, but it is your easiest 3 failed drive answer.