Moving old parity drive into data array - wipe or preclear required?

[dtbingle]

Current config is (2) 10TB and (4) 3TB drives with a single parity setup.

Bought a 14TB drive to replace the existing 10TB parity drive and let Unraid rebuild parity with the new 14TB parity drive in place.

 

Now I want to take the old 10TB parity drive and replace a 3TB data drive in the disk array.

 

Do I need to preclear, or at a minimum format, the old 10TB parity drive before adding to the disk array and letting it rebuild?

[JonathanM]

19 minutes ago, dtbingle said:

Do I need to preclear, or at a minimum format, the old 10TB parity drive before adding to the disk array and letting it rebuild?

Neither. Rebuilding an existing drive replaces ALL the bits on the drive, overwriting any existing content including a format.

[dtbingle]

Got it, Thanks!

So just pop it in, assign disk, and start rebuild.  Then it will just rebuild the pre-existing 3TB of data and write zeros for remaining 7TB?