August 2, 20196 yr Hi guys. I wanted to replace one of my drives with one of higher capacity. I had read that I should preclear the new drive then pull out the one to be replaced and allow a data rebuild to occur. I am replacing a 2TB drive with a 10TB drive. The 2TB drive had 615GB of data on it, and I had assumed that once it rebuilt that it would be complete. It is now at 750GB and is still reading from all drives and writing to the new one. I was under the impression that because I precleared the drive it would simply rebuild the necessary data and be done. I must've been mistaken, but what would happen if I cancelled the operation at this point?
August 2, 20196 yr 1 hour ago, satmeiler said: the drive it would simply rebuild the necessary data and be done. No, let it rebuild. It will writing whole 10TB.
August 2, 20196 yr Community Expert 1 hour ago, satmeiler said: Hi guys. I wanted to replace one of my drives with one of higher capacity. I had read that I should preclear the new drive then pull out the one to be replaced and allow a data rebuild to occur. I am replacing a 2TB drive with a 10TB drive. The 2TB drive had 615GB of data on it, and I had assumed that once it rebuilt that it would be complete. It is now at 750GB and is still reading from all drives and writing to the new one. I was under the impression that because I precleared the drive it would simply rebuild the necessary data and be done. I must've been mistaken, but what would happen if I cancelled the operation at this point? Preclear has no effect on a rebuild as the rebuild process will always write to every sector on the new disk. Parity (and thus rebuild) has no concept of data - it is merely concerned with the fact that every sector on the disk needs a specific bit pattern. Until the rebuild has completed writing the whole 10TB to the new disk it will not be usable so you do not want to cancel it as that would merely mean starting it again from the beginning.
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