Lyror Posted December 4, 2019 Share Posted December 4, 2019 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 Quote Link to comment
JonathanM Posted December 4, 2019 Share Posted December 4, 2019 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. Quote Link to comment
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