Some BTRFS issues

[Jaster]

Hi Guys,

 

I'm facing some weird issues with a BTRFS pool. I am using 6 HDDs in RAID10 mode.

Issue #1: the pool isn't beeing used atm, but the drives keep spinning up on a regular basis.

Issue #2: I was using 4 drives and added two new drives. I tried also removing the Pool and creating a new one, but nothing changed. The capacity is being displayed wrong. Is says 20TB free, 3GB used (no data there!) and 30TB total - it should be 30TB free.

 

Diagnostics are attached. Thanks!

natasha-diagnostics-20210522-1221.zip

[JorgeB]

It's a known btrfs bug, raid1 pools with an odd number of devices or raid10 pools with non multiple of 4 devices will display the wrong free space, but all the pool space can be used and the free space will be less incorrect as the pool fills up.

[Jaster]

Any Idea about the spin up/down?

[JorgeB]

There are multiple threads and bug reports about that, you can look at them for any ideas.

[Jaster]

I'm not certain those are the same issues. My issue only effects the disks inside the pool - the array works fine. The drives do spin down, but are spun up again on a regular basis.

[ChatNoir]

16 minutes ago, Jaster said:

I'm not certain those are the same issues. My issue only effects the disks inside the pool - the array works fine. The drives do spin down, but are spun up again on a regular basis.

Still the procedure to try and find the cause would be the same:

• Shut down everthing (VM, Dockers, etc) and let it sit for 2x the time it generally take to have a spin up.
• If it stays down, start a service one at a time and see it the drives do spin up.
• Rince and repeat until you find the cause.

 

If it still spins up with nothing running, might be something with another computer, a plugin or Unraid itself.

[Jaster]

There are no VM on the machine and not even a share on the pool atm.

[Jaster]

Update: I tried turning off docker, all scripts, etc. Nothing changes. The drives keep spinning up and down. Not sure how to proceed from here...

[JorgeB]

I've not aware of spin down issues because of being a pool, I have several pools myself and they all spin down, are you using a different controller for the pool devices? You can also post the diags.

[Jaster]

diags are at my first post. I'm using an adaptec (1100) controller for all the HDDs. No clue how to find "the criminal". Disks are getting pretty hot as they are spinning non-stop

[JorgeB]

17 hours ago, Jaster said:

adaptec (1100) controller

The same is happening to other users with the same controller.

 

17 hours ago, Jaster said:

Disks are getting pretty hot as they are spinning non-stop

Then you should improve the cooling, or they will also overheat when you need to run a scrub or some other high i/o operation.

[Jaster]

My issue seems not be the same, as the drived do spin down, but spin "magicly" up again after a short while... and spin down again...

Tried the SAS PlugIn, but hasn't changed much.

Shall I post in that thread you linked?

[JorgeB]

6 minutes ago, Jaster said:

Shall I post in that thread you linked?

You can.