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Lyror

Replace a drive in my Array

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Hello

 

I'm gonna swap a 2TB hard drive in the array for a larger 4TB tonight. My parity disk 4TB has been in use for 2 years. Should I use the new disk as parity and the old partiy disk as new data disk, so that if a failure happens, the chance is higher that the parity disk is still ok? What do you think?

 

Lyror

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4 hours ago, Lyror said:

Should I use the new disk as parity and the old partiy disk as new data disk, so that if a failure happens, the chance is higher that the parity disk is still ok?

No. Parity is less important than data disks, not more. Parity in a multiple disk array set by itself is useless, it needs all the other data disks to reconstruct a failed disk.

 

Consider an array with 1 parity and 4 data disks. If 1 disk fails, it can be rebuilt. If 2 disks fail together, neither can be rebuilt. If you have 2 data disk fail, you lose all the data on both disks. If one of the failures is parity, then you only lose data on 1 disk. In a multiple disk failure, I'd much rather one of the failures be parity.

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