"kernel: BTRFS error" leads to cache unmount and loss of all Dockers and VMs

[Dubbs01]

Hello - 

 

My system is experiencing an issue where it seems to be unmounting my cache drive and Unraid loses access to AppData and ISOs required to support Dockers and VMs.  If left long enough, the system also grinds to a halt eventually and I am not able to access any screen through the Unraid UI. 

 

The issue happens every 10 days or so, although this week it only took a day for the system to fail on me.  I have found the only way to solve this has been a forced shutdown of my machine.  After shutdown, the cache is visible and mounted again.  If I only reset, the cache drive cannot be assigned!

 

I am not sure what could be triggering this issue or how to resolve.  I thought the issue might be similar to this, but I could not resolve the same way: https://forums.unraid.net/topic/46802-faq-for-unraid-v6/?do=findComment&comment=543490.  Shutdown is the only solve.

 

Thanks very much for your help!

 

 

 

lansdownebrain-diagnostics-20240917-1818.zip lansdownebrain-syslog-20240917-2225.zip

[JorgeB]

Pool filesystem is going read-only, with btrfs recommend backing up the pool and re-formatting.

[Dubbs01]

Hello @JorgeB - thanks very much.  

 

Any idea how something like this could happen?  So I can avoid in the future?  Thanks.

[JorgeB]

Difficult to say now, but if it keeps happening, there's like an underlying hardware issue.

[Dubbs01]

Hi - bit of an update on this.  My machine has been up for 15 days without interruption - this is after I shutoff automatic backups from the "appdata backup plugin"

 

Would this plugin cause the kind of issue with my cache drive I've experienced? Thanks again.

[Kilrah]

Nope, but it'll put load on the system so again that suggests a hardware issue. 

[Dubbs01]

I have a theory that I could use help verifying:

 

I think I have linked this issue to my Windows VM running Blue Iris camera recording software.  After my 2 week streak, I went into my cameras and later that day my setup required a shutdown.  I think I have the VM setup with access to too many CPU cores and coupled with some kind of software issue - the VM is taking the CPUs up to 100% and causing my entire rig to screw up.

 

Could this explain the read-only behaviour for the cache drive?

 

Solutions:

1) fix software config issue with BlueIris software (or start over with new VM)

2) reassign cores so the VM doesnt have access to all cores

3) I can still format my cache pool but it doesnt make sense to me that a hardware issue like that would happen spontaneously?

 

Thanks all in advance. 

[JorgeB]

1 hour ago, Dubbs01 said:

Could this explain the read-only behaviour for the cache drive?

Seems unlikely to me.