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danejaho

RAID0 Parity Drive

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I currently have 6 - 3TB drives in my unRAID server and I'd like to start buying 6TB drives as the price has come down. I know I will need a 6TB parity drive to cover the new 6TB array drives, so would it be possible to use two of my old 3TB together to create a single 6TB parity drive for unRAID?

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Only if you have a hardware RAID card.  But even there, I wouldn't recommend it as you would effectively be doubling the chances that the parity "drive" would die (as there's two members)

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I'm not sure the idea is really that useful either.

Let's look at a couple examples:

 

starting point, 3x 3TB drives, (1 parity, 2 data, 6TB total).

you have effectively 6TB of data storage.

add 1 6TB drive (parity). retask 3TB parity as data.

data increase: +3TB (9TB)

add 2nd 6TB drive (data).

data increase: +6TB (15TB)

add 3rd 6TB drive (data)

data increase: +6TB (21TB)

 

now, starting from the same 3x 3TB...

add: 1st 6TB (data), retask 2x 3TB as parity (RAID0 6TB)

data increase: 0TB (9TB)

add 2nd 6TB drive (data)

data increase: +6TB (15TB)

add 3rd 6TB drive (data)

data increase: +6TB (21TB)

 

you've come to the same place, but now you've added complexity and increased failure potential.

 

about the only hardware RAID i've considered is potentially RAID1 for the parity drive, but even that is problematic.

Edited by sota

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The other problem with trying to RAID together 2x3TB drives to get 6TB is if the result is even 1 byte less than a genuine 6TB drive then you will not be able to use it as parity in conjunction with 6TB data drives.

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