I had an array of six 8TB drives with two of them parity drives.  I needed some more drives for another project so i got three 16 TB drives and planned on swapping them for the 8 TB drives.   I swapped out the parity drive and rebuilt the array then did the same for Parity 2 with no issues. 

Now when i try and add(or replace) the last 16 TB drive to the array it says i cant start the array because "Disk in parity slot is not biggest."

All three of these 16 TB drives are the same model and the exact same size.  I tried to pre-clear the drive before adding and that didn't help either.

I have attach the diagnostics zip.  Any help would be greatly appreciated.

 

 

nas-diagnostics-20221120-1924.zip

Most likely parity has the partition starting on sector 2048, parity2 looks OK, but post the output of

fdisk -l /dev/sdX

for both.

Yup you are correct.  I did use the parity drive before i added it and did not pre-clear it.

parity (sdj)

root@NAS:~# fdisk -l /dev/sdj
Disk /dev/sdj: 14.55 TiB, 16000900661248 bytes, 31251759104 sectors
Disk model: ST16000NE000-2RW
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 969E3CEE-0602-3C4B-8C24-CCB4AF681B02

Device     Start         End     Sectors  Size Type
/dev/sdj1   2048 31251759070 31251757023 14.6T Linux filesystem

Parity 2 (sdk)

root@NAS:~# fdisk -l /dev/sdk
Disk /dev/sdk: 14.55 TiB, 16000900661248 bytes, 31251759104 sectors
Disk model: ST16000NE000-2RW
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 0373AE92-FB71-44E1-84F2-5740B340029F

Device     Start         End     Sectors  Size Type
/dev/sdk1     64 31251759070 31251759007 14.6T Linux filesystem

drive I'm trying to add (sdd)

root@NAS:~# fdisk -l /dev/sdd
Disk /dev/sdd: 14.55 TiB, 16000900661248 bytes, 31251759104 sectors
Disk model: ST16000NE000-2RW
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x00000000

Device     Boot Start        End    Sectors Size Id Type
/dev/sdd1           1 4294967295 4294967295   2T  0 Empty

Partition 1 does not start on physical sector boundary.

 

So it looks like I need to take this new drive and make it the Parity drive.  correct?

 

You can just stop the array, unassign parity, start array, stop array, re-assign parity, click on parity and chose the "erase" option, then re-sync parity.

Thank you very much for your help