Forum Discussion

Aspirant

Oct 11, 2015

btrfs-cleaner always stuck at 100% CPU after 6.4.0 upgrade

Hello, After 6.4.0 upgrade btrfs-cleaner process always uses 100% cpu even after many uptime hours. SMB shares are ok (but slow) Frontview times out after authentication. Top command (ssh i...

Installation & Upgrade

TonyKL

Guide

Oct 12, 2015

Thanks for the info, I have had the box with the cleaner stopped but as soon as I touch the filesystem it's off again. It must think I'm really dirty to need to spend all day cleaning. I have about 6TB of data.

I'm trying to clean up and delete old snapshots but ever one I delete freezes my NAS for a good 10 minutes +

spotcatbug

Apprentice

Oct 12, 2015

I'm not seeing that same symptom, where touching the filesystem sets off btrfs-cleaner again. I've been using the NAS all morning (since btrfs-cleaner stopped) without incident. I'm keeping an eye on a running top command, just to see if it pops in there again, but so far it's OK.

This wouldn't be the first time I had the NAS go from unusable to usable since 6.4.0. I've had it do this a few times now. This time is different, however; it's remained usable through reboot. I did try the USB recovery and that kept it from happening through one reboot. I want to reboot again, to see if it continues to be usable, but I have work to do, so that will have to wait until later today.

spotcatbug
Apprentice
Oct 13, 2015

@I wrote:

I want to reboot again, to see if it continues to be usable, but I have work to do, so that will have to wait until later today.

So I booted it up this morning, as per usual. btrfs-cleaner is at it again and the NAS is unusable... again.
- TonyKL
  Guide
  Oct 13, 2015
  Finally I think my btrfs-cleaner has stopped.
  
  It could just be because I had 5TB of data that it took ages to munge through, or it could be the fact that I deleted all my snapshots that has stopped it. Maybe we just need to be a little more patient?
  - JasperA
    Apprentice
    Oct 13, 2015
    Mine has stopped yesterday, so I fired up my vSphere environment again, using NFS shares from my NAS.
    Unfortunately the NAS became useless again over night and this morning btrfs-cleaner was running again. Probably because of the Smart Snapshot Manager removing a bunch of snapshots.
    
    I'm now facing a few options: Disable quota (how?), Disable snapshotting, Disable or kill btrfs-cleaner (impossible?), ...
    
    Okay, I must admit; throwing the NAS out of the window really came to mind as one of the options. This is driving me insane.