I have currently dual parity and 14 array drives however I plan to replace 2x4tb and a 3tb drive with 2x10tb so I’m trying to figure out how to do this without running 3x parity rebuilds. I wonder if I should move all data off the 3tb drive to the array but I’m not sure if I could then just do a new config leaving all but this drive in the position and then replace the 2 other drives and do a parity rebuild or is that logic wrong?

 

 

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That would be the fastest and easiest approach, but the array would be unprotected against another drive failing until the parity rebuild completes.

so which is the safest approach without doing 3 parity rebuilds?

1 hour ago, MrLondon said:

so which is the safest approach without doing 3 parity rebuilds?

The only safe approach is 3 rebuilds, so you have to decide whether speed/convenience matters more than the (probably unlikely) chance of array disk failing while rebuilding parity.   Do you have backups if this happens (you should have ).

I have a 100tb array... so you can image that most data is not protected by a backup. My most important files (pictures and documents are backup on 3 locations. Would moving data from the 3tb to clear it and then replace that together with another one would be safer?