Biggest drive not a parity drive with two equally sized drives

[JMineable]

Hi Unraid community,

 

I am running into a problem assigning a 8TB drive to my data drive pool.

 

Recently I bought two HGST HUH728080AL4200 (8TB drives) orginally they are formatted in 4kn sectors, but because my PERC H710P Mini does not support this format I reformatted them to 512 sectors.

 

My current setup is shown in the picture below:

 

The problem is that when I try to move parity drive (1 or 2) to the data pool it says the biggest drive is not a parity drive.

 

What I tried so far:

• Swap parity positions,
• Unassigning one of them and re-adding to the drive pool,
• Swapping with a data drive.

 

Omreport reports that both drives are exactly the same size as shown in the pictures below:

ID: 0

ID: 6

 

I really hope someone is able to help!

 

Kind regards,

 

Jorn

[trurl]

This is one of many problems which can be caused by using RAID controller.

 

Go to Tools - Diagnostics and attach the complete Diagnostics ZIP file to your NEXT post in this thread.

[JMineable]

Thanks for the fast response!

 

I have included the diagnostics here:

thecore-diagnostics-20201101-1715.zip

 

Quote

This is one of many problems which can be caused by using RAID controller.

I was actually worried about this.

I really don't want to flash my raid card into IT mode if it can be prevented.

[trurl]

2 minutes ago, JMineable said:

I really don't want to flash my raid card into IT mode

This is exactly what you want to do or you will have this problem and others.

[JMineable]

Okay then...

 

I quess I need to find a compatible controller in IT mode for my R720xd. Any suggestions perhaps?

 

Are there any workarounds I might be able to try?

  Like making one disk smaller?

[JMineable]

Sooo.... I kinda cheated.

 

I unassigned the second parity drive and formated it with parted so it would be a little bit smaller and it worked

Not suggested as a permanent solution!