I have recently rebooted my Unraid 6.7.2 server and now three of my drives are missing and the array won't start. The good thing the drives didn't have any data on them. 

Edited September 21, 20196 yr by jonyunger
Solution

Go to Tools-diagnostics and attach the complete Diagnostics zip file to your next post. 

Thank you Trurl for the response.
To fix this issue I went to Tools New Config. While in I Preserve current assignments All. Then I reformatted the drives. 

That may have got you going again but it doesn't explain what happened to get you into that state. If it happens again post your diagnostics. Obviously your "solution" isn't ideal if you have data on your system.

I suspect you have some problem with a controller that isn't identifying the disks consistently, and so Unraid doesn't recognize them. I won't be at all surprised if it happens again.

You were correct trurl after the reboot of the server I lost the same three drives.

Attached is the diagnostics files

plex-diagnostics-20190921-2048.zip

I think you probably need to flash the firmware of that controller to IT mode or else use something else.

Thank you trurl

Trurl,

 

I have a Dell PowerEdge R710 Server that I made into my Unraid server. 
What firmware would I download?
https://www.dell.com/support/home/us/en/04/product-support/product/poweredge-r710/drivers

If I flash the Raid controller wouldn't that remove my raid?

I'm not familiar with that.

45 minutes ago, jonyunger said:

If I flash the Raid controller wouldn't that remove my raid?

You don't want to use RAID with Unraid.

 

Here is another thread I found by googling "unraid r710". There are lots of others:

 

https://forums.unraid.net/topic/59741-unraid-from-desktop-server-to-dell-r710-not-working/