June 5, 20197 yr I'm running Unraid 6.6.7 I just recently replace my two old parity drives with new ones. I was wondering if i wanted to use them to replace old data drives or just as data drives if i still have to go through the preclear process. Thanks in advance.
June 5, 20197 yr Community Expert You never need to do a preclear on a drive that is replacing an existing one. The rebuild process writes to every sector erasing any existing contents. The only reason for running a pre-clear would be for it’s stress test functionality on a drive that you are not sure that you trust.
June 5, 20197 yr Author 2 hours ago, itimpi said: You never need to do a preclear on a drive that is replacing an existing one. The rebuild process writes to every sector erasing any existing contents. The only reason for running a pre-clear would be for it’s stress test functionality on a drive that you are not sure that you trust. So it would be safe to just add these as data drives? As they where cleared and where running as parity already correct? Just always like to ask before i do anything to be on the safe side thank you.
June 6, 20197 yr Community Expert 4 hours ago, cherritaker said: So it would be safe to just add these as data drives? As they where cleared and where running as parity already correct? Just always like to ask before i do anything to be on the safe side thank you. A parity drive does not contain all zeroes, so If you add them as an additional drive(s) (rather than using them to replace an existing data drive), then Unraid will clear them to zeroes when you first add them to the array. You will not be able to use them to actually hold data until the Clear stage finishes but the array itself will be available. This Clear process is effectively the middle write phase of the preclear process, but done by Unraid itself rather than via a plugin.
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